protoLabsAI
diff --git a/‎README.md‎
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diff --git a/‎coder_seam.py‎
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@@ -46,6 +46,16 @@ board to a PR — or fork it as a starting point.
   requires a spec, EARS acceptance criteria, and explicit `files_to_modify`.
 - **Escalation (opt-in)** — with a `coders` map of >1 distinct delegate, a capability
   failure climbs a model tier (`fast→smart→reasoning`) and blocks at the top.
+- **coder.solve() board seam (ADR 0064 P2)** — on a fresh build, when the
+  [`coder`](https://github.com/protoLabsAI/protoAgent/tree/main/plugins/coder) plugin
+  is enabled AND the feature has acceptance criteria AND `coder_solve_test_cmd` (or
+  `local_gate_cmd`) is set, the loop dispatches through `coder.solve()`'s
+  execution-grounded ladder (greedy → best-of-k → tree-search) instead of a single
+  `delegate_to(acp)` shot — gated on the feature's acceptance tests actually PASSING
+  in a real candidate worktree, never an LLM judge. Composes WITH the tier ladder
+  above (solve() searches *within* a tier; a search that never passes escalates a
+  tier, or blocks, exactly like a no-diff dispatch). Missing coder/acceptance/test
+  command ⇒ honest degrade to the single shot — see `coder_seam.py`.
 - **Planning layer** — two reasoning subagents (`decompose` + `antagonist`) driven by
   the `decompose-project` skill: idea → outline → MADR ADRs → epics › milestones ›
   features, hardened by an adversary, with a per-epic human gate.
@@ -99,6 +109,11 @@ project_board:
   # With local_gate_cmd set, Max-Mode is EXECUTION-GROUNDED (ADR 0064): the winner is
   # picked from candidates whose gate actually PASSES; the LLM judge only breaks ties
   # among the passing set (or decides when no gate is set / none pass).
+  coder_solve: true          # OPT-OUT valve for the ADR 0064 P2 seam (default on; the
+                             # real gate below still requires the `coder` plugin +
+                             # acceptance criteria + a test command — see "What it does").
+  coder_solve_test_cmd: "pytest tests/ -q"  # solve()'s verify() oracle; falls back to
+                             # local_gate_cmd if blank, else the seam honest-degrades.
   # webhook_secret: "..."    # set before exposing /webhook/pr publicly
 ```
 
@@ -124,6 +139,7 @@ project_board:
 | `store.py` | the `br`/beads wrapper — board projection + the Ready/Done invariants |
 | `loop.py` | the puller: `ready → worktree → coder → PR → in_review` (+ opt-in escalation) |
 | `worktree.py` | per-feature worktree lifecycle, scoped coder dispatch, `open_pr` |
+| `coder_seam.py` | the ADR 0064 P2 seam — dispatches a build through `coder.solve()` when available, else honest-degrades |
 | `api.py` | the HTTP API + the `/webhook/pr` Done edge (HMAC-verified) |
 | `board_view.py` | the Kanban/list console view |
 | `retro.py` | loop-retro mining: bead attempt/outcome history → recurring failure classes (the self-improving flywheel) |
 
@@ -0,0 +1,331 @@
+"""The P2 board seam (ADR 0064): dispatch a feature's build through the `coder`
+plugin's execution-grounded ``solve()`` ladder instead of a single
+``delegate_to(acp)`` shot — greedy → best-of-k → tree-search, gated on the
+feature's acceptance tests actually PASSING in a real worktree, never an LLM judge.
+
+**Composes** `plugins.coder.solve` (a separate, git-URL-installed plugin — imported
+lazily/best-effort so this repo carries no hard dependency on it and no import-time
+coupling) with THIS repo's own worktree primitives. The coder plugin never sees a
+board worktree; it only supplies the deterministic ladder (`solve()`, `Budget`,
+`Verdict`). Each candidate the ladder tries gets its OWN throwaway worktree — the
+"independent-parallel acp attempts" `coder`'s own generator module already flags as
+"the P2 path" (`plugins/coder/generate.py`) — and the winning (test-passing)
+candidate is PROMOTED to the feature's canonical worktree/branch so the rest of the
+drive (fixups, the pre-PR local gate, `open_pr`, the CI bounce, tier escalation) is
+UNCHANGED; every other candidate is reaped.
+
+**Honest degrade** (ADR 0064's no-LLM-judge rule, applied at the board layer): the
+dispatch decision (``should_use_solve``) requires ALL THREE — the `coder` plugin
+importable (the host has it enabled), the feature's acceptance criteria present
+(the Ready gate's oracle), and a configured, runnable acceptance-test command (the
+actual executable verifier — `solve()` cannot run prose). Missing any of the three
+⇒ the caller falls back to today's single ``delegate_to(acp)`` shot; never a silent
+best-of-k/judge substitute.
+
+**Deferred** (see the ADR + the PR that lands this): compiling EARS acceptance
+criteria into a generated test file. The simplest-correct path used here instead:
+the coder is already prompted (``loop._build_prompt``) to write tests satisfying
+the acceptance criteria as part of its definition of done; this module's ``verify``
+just RUNS whatever tests exist in a candidate's worktree via the configured command
+and gates on its exit code — real execution, no fabricated grounding.
+"""
+
+from __future__ import annotations
+
+import asyncio
+import importlib
+import logging
+from typing import Callable
+
+from . import worktree
+
+log = logging.getLogger("protoagent.plugins.project_board")
+
+
+class SolveExhausted(worktree.WorktreeError):
+    """``coder.solve()`` spent its whole generation budget against this feature's
+    acceptance tests and no candidate passed. A CAPABILITY failure for the CURRENT
+    model tier — real diffs existed, they just failed the tests, so this is NOT
+    "no diff" — but the loop treats it exactly like ``NoChangesError``/
+    ``CoderTimeout``: escalate a configured tier ladder, or block. Never opens a PR
+    on an unverified best-partial (ADR 0064's honest-degrade contract)."""
+
+
+def _import_solve():
+    """Best-effort import of the `coder` plugin's solve library. Returns the module,
+    or ``None`` — `coder` is a separate, git-URL-installed plugin (ADR 0064), not a
+    dependency of this one, and it ships DISABLED by default, so absent/disabled is
+    the expected common case (not an error worth logging)."""
+    try:
+        return importlib.import_module("plugins.coder.solve")
+    except Exception:  # noqa: BLE001 — coder plugin absent/disabled → honest degrade
+        return None
+
+
+def should_use_solve(feature: dict, *, test_cmd: str, _solve_mod=None) -> bool:
+    """The P2 dispatch decision (ADR 0064): use `coder.solve()` only when ALL of —
+    the `coder` plugin is importable, the feature carries acceptance criteria (the
+    Ready gate's oracle), and a runnable acceptance-test command is configured (the
+    actual verifier `solve()` gates on — prose acceptance criteria alone isn't
+    executable). Missing any ⇒ False, the honest degrade to a single delegate_to(acp)
+    shot. ``_solve_mod`` is a test-injection seam; production callers never pass it —
+    the real best-effort import happens here."""
+    mod = _solve_mod if _solve_mod is not None else _import_solve()
+    if mod is None:
+        return False
+    if not str(feature.get("acceptance_criteria") or "").strip():
+        return False
+    if not str(test_cmd or "").strip():
+        return False
+    return True
+
+
+def _augment_prompt(task: str, feedback: str | None) -> str:
+    """Fold the ladder's failing-test feedback into the next candidate's prompt.
+    Every candidate gets a FRESH worktree off base (see ``_WorktreeSolveAdapter`` —
+    the same "fresh-both" discipline ``worktree.dispatch_coder`` already documents
+    for re-dispatches), so the coder is told explicitly there is no prior diff to
+    build on in THIS worktree — only the failure to fix."""
+    if not feedback:
+        return task
+    return (
+        f"{task}\n\n"
+        "## Your previous attempt FAILED the acceptance tests — fix exactly this\n"
+        "This is a fresh worktree (no prior diff here); re-implement with the failure "
+        f"below in mind:\n{feedback.strip()}\n"
+    )
+
+
+class _WorktreeSolveAdapter:
+    """Adapts `coder.solve()`'s ``generate``/``verify`` contract onto board
+    worktrees. `solve()` treats a candidate as an opaque string; here that string is
+    a candidate's WORKTREE PATH, not code text — the coder edits files, it doesn't
+    return a source string. Each ``generate()`` call creates a fresh throwaway
+    worktree, dispatches the ACP coder into it, and hands the path back; ``verify()``
+    then runs the acceptance-test command in that same worktree and reports real
+    pass/fail. Tracks every candidate worktree it creates so the caller can promote
+    the winner and reap the losers."""
+
+    def __init__(
+        self,
+        *,
+        repo: str,
+        base: str,
+        root: str,
+        fid: str,
+        coder,
+        dispatch_timeout: float | None,
+        test_cmd: str,
+        test_timeout: float,
+        verdict_cls,
+    ):
+        self.repo = repo
+        self.base = base
+        self.root = root
+        self.fid = fid
+        self.coder = coder
+        self.dispatch_timeout = dispatch_timeout
+        self.test_cmd = test_cmd
+        self.test_timeout = test_timeout
+        self.verdict_cls = verdict_cls  # `plugins.coder.solve.Verdict` — passed in, never imported here
+        self.candidates: list[tuple[str, str]] = []  # (worktree_path, branch)
+        # `git worktree add` against the SAME repo must not run concurrently (best-
+        # of-k dispatches `generate()` via asyncio.gather) — serialize just that
+        # step; the slow part (the coder dispatch) still runs in parallel.
+        self._wt_lock = asyncio.Lock()
+        self._n = 0
+
+    async def generate(self, task: str, *, feedback: str | None = None) -> str:
+        self._n += 1
+        cid = f"{self.fid}.g{self._n}"
+        async with self._wt_lock:
+            wt, branch = await worktree.create_worktree(self.repo, self.base, cid, self.root)
+        self.candidates.append((wt, branch))
+        await worktree.dispatch_coder(self.coder, wt, _augment_prompt(task, feedback), timeout=self.dispatch_timeout)
+        return wt
+
+    async def verify(self, candidate_wt: str):
+        Verdict = self.verdict_cls
+        try:
+            proc = await asyncio.create_subprocess_shell(
+                self.test_cmd,
+                cwd=candidate_wt,
+                stdout=asyncio.subprocess.PIPE,
+                stderr=asyncio.subprocess.STDOUT,
+            )
+        except OSError as exc:
+            return Verdict(passed=False, total=1, failed=1, output=f"could not launch acceptance tests: {exc}")
+        try:
+            out, _ = await asyncio.wait_for(proc.communicate(), timeout=self.test_timeout)
+        except asyncio.TimeoutError:
+            try:
+                proc.kill()
+            except ProcessLookupError:
+                pass
+            await proc.wait()
+            # Unlike the pre-PR local gate (which fails OPEN on a timeout — a broken
+            # gate must never block otherwise-good work), THIS is the ladder's own
+            # search oracle: a candidate we couldn't confirm passed must never be
+            # silently treated as passing, or we'd be faking grounding.
+            return Verdict(
+                passed=False, total=1, failed=1, output=f"acceptance tests timed out after {self.test_timeout:.0f}s"
+            )
+        text = (out or b"").decode("utf-8", "replace").strip()
+        ok = proc.returncode == 0
+        return Verdict(
+            passed=ok,
+            total=1,
+            failed=0 if ok else 1,
+            failing=[] if ok else [f"{self.test_cmd!r} (exit {proc.returncode})"],
+            output=text[-4000:],
+        )
+
+
+RecordGens = Callable[[int], None]
+
+
+def _record_gens_best_effort(record_gens: RecordGens, fid: str, n: int) -> None:
+    """Call ``record_gens(n)`` and swallow any exception it raises.
+
+    ``store.record_gens_spent`` documents itself as fire-and-forget ("a br hiccup
+    here must never fail the build the way a missing PR would") — a transient `br`
+    failure (lock contention, a flaky CLI invocation, a race with a concurrent
+    label write) must never propagate out of ``dispatch()``. Left unguarded, it
+    would surface as an unrelated ``BoardError`` past every capability-failure
+    handler in the caller's loop, discarding an already-verified (or already-
+    reaped) candidate purely because of a bookkeeping label write."""
+    try:
+        record_gens(n)
+    except Exception:  # noqa: BLE001 — fire-and-forget cost accounting, never fails the build
+        log.warning("[project_board] %s record_gens(%d) failed (ignored — fire-and-forget)", fid, n, exc_info=True)
+
+
+async def dispatch(
+    *,
+    task: str,
+    coder,
+    repo: str,
+    base: str,
+    root: str,
+    fid: str,
+    dispatch_timeout: float | None,
+    test_cmd: str,
+    test_timeout: float,
+    budget: int,
+    k: int,
+    tree_depth: int,
+    record_gens: RecordGens | None = None,
+    _solve=None,
+    _budget_cls=None,
+    _verdict_cls=None,
+) -> tuple[str, str, str]:
+    """Run the execution-grounded ladder for one feature build.
+
+    Returns ``(worktree, branch, result_text)`` on a passing candidate — the SAME
+    3-tuple shape ``_dispatch_max_mode`` returns, so the caller's downstream drive
+    (fixups, local gate, ``open_pr``) is unchanged. Raises :class:`SolveExhausted`
+    (a capability failure) when the budget is spent with no passing candidate, after
+    reaping every candidate worktree it created.
+
+    ``record_gens`` (if given) is called with ``result.gens_spent`` exactly once,
+    win or lose — the cost accounting (ADR 0064) must survive a failed search too.
+    ``_solve``/``_budget_cls``/``_verdict_cls`` are test-injection seams for
+    ``solve()``/``Budget``/``Verdict``; production callers never pass them (the real
+    import happens here, deferred so this module carries no hard dependency on the
+    `coder` plugin).
+
+    **``solve()`` itself can raise.** The ladder (`coder`'s own ``solve.py``) has no
+    try/except around ``generate``/``verify`` — it assumes a candidate attempt never
+    errors, only that it might fail its tests. A REAL dispatch can still raise
+    (``CoderTimeout`` on one best-of-k candidate, a worktree op erroring) and that
+    propagates straight out of ``solve()`` uncaught. Every worktree ``generate()``
+    already created for THIS run is tracked in ``adapter.candidates`` (appended right
+    after ``create_worktree`` returns, before the dispatch that might fail) but would
+    otherwise leak forever: it's untracked in the loop's ``_inflight`` map until this
+    function returns, and invisible to the health sweep (a `.gN` candidate id isn't a
+    real board feature, so the sweep's own ``get_feature`` lookup raises and the sweep
+    skips it rather than reaping). So any exception here reaps every candidate seen so
+    far, surfaces the attempted cost, and re-raises the ORIGINAL exception unchanged —
+    the loop's existing capability-failure handling (retry/escalate/block) still
+    applies to whatever it actually was."""
+    if _solve is not None:
+        solve, Budget, Verdict = _solve, _budget_cls, _verdict_cls
+    else:
+        from plugins.coder.solve import Budget, Verdict, solve
+
+    adapter = _WorktreeSolveAdapter(
+        repo=repo,
+        base=base,
+        root=root,
+        fid=fid,
+        coder=coder,
+        dispatch_timeout=dispatch_timeout,
+        test_cmd=test_cmd,
+        test_timeout=test_timeout,
+        verdict_cls=Verdict,
+    )
+    try:
+        result = await solve(
+            task,
+            generate=adapter.generate,
+            verify=adapter.verify,
+            budget=Budget(budget),
+            k=k,
+            tree_depth=tree_depth,
+        )
+    except Exception as exc:
+        for wt, branch in adapter.candidates:
+            await worktree.remove_worktree(repo, wt, branch)
+        if record_gens is not None and adapter._n:
+            # `solve()` never got to return a `gens_spent` count — the attempted
+            # generation count is the honest stand-in (a failed dispatch still spent
+            # the gen; ADR 0064's cost accounting doesn't get to look the other way).
+            # Best-effort per store.record_gens_spent's own contract ("a br hiccup
+            # here must never fail the build"): the worktrees above are ALREADY
+            # reaped and the original exception below is what the loop must see —
+            # a transient `br` failure recording the spend must never mask it.
+            _record_gens_best_effort(record_gens, fid, adapter._n)
+        log.warning(
+            "[project_board] %s coder.solve raised mid-ladder (%d candidate(s) reaped): %s",
+            fid,
+            len(adapter.candidates),
+            exc,
+        )
+        raise
+    if record_gens is not None:
+        # Same fire-and-forget contract as above: a bookkeeping failure here must
+        # never discard a candidate that ALREADY exists on disk (test-verified or
+        # not) — the promote/reap logic below still has to run either way.
+        _record_gens_best_effort(record_gens, fid, result.gens_spent)
+
+    if not result.passed or not result.solution:
+        for wt, branch in adapter.candidates:
+            await worktree.remove_worktree(repo, wt, branch)
+        detail = result.verdict.feedback() if result.verdict else ""
+        log.info(
+            "[project_board] %s coder.solve exhausted (rung=%s, gens=%d/%d) — no candidate passed",
+            fid,
+            result.rung,
+            result.gens_spent,
+            budget,
+        )
+        raise SolveExhausted(
+            f"coder.solve exhausted after {result.gens_spent} generation(s) (rung={result.rung}): "
+            f"{detail or result.note}"
+        )
+
+    win_wt = result.solution
+    win_branch = next(b for wt, b in adapter.candidates if wt == win_wt)
+    canon_wt, canon_branch = await worktree.promote_worktree(repo, win_wt, win_branch, fid, root)
+    for wt, branch in adapter.candidates:
+        if wt != win_wt:
+            await worktree.remove_worktree(repo, wt, branch)
+    log.info(
+        "[project_board] %s coder.solve verified by acceptance tests (rung=%s, gens=%d/%d)",
+        fid,
+        result.rung,
+        result.gens_spent,
+        budget,
+    )
+    result_text = f"[coder.solve rung={result.rung} gens={result.gens_spent}] {result.note}"
+    return canon_wt, canon_branch, result_text