chore(release): v0.1.25 — Now horizon (N1, N2, N3, N4) + P0 wave (#31)

Bumps package.json + package-lock.json from 0.1.24 to 0.1.25 and
extends releases/v0.1.25.md to cover every theme that landed since
v0.1.24:

- N1 durability (#29): atomic writes, registry lock, fsync-before-rename
- N2 account-service split (#30): 1675 LOC -> 164 LOC orchestrator + 12 modules
- N3 error taxonomy + --json (#28): AuthmuxError base, stable codes, JSON envelope
- N4 lazy path resolvers (#27): bare constants deprecated for v0.2.0
- P0 wave (#26): secure perms, [y/N] update prompt, kiro ENOENT, CI matrix,
  registry proxy-source round-trip, 18k-line improvement docs

Notes follow the canonical 7-section shape from
docs/future/17-ROADMAP.md (Added, Changed, Fixed, Deprecated, Removed,
Security, Migration), with the prior Durability section folded into a
"Theme deep-dives" appendix so the canonical shape is intact.

No code changes. No npm publish.

Verification:
- npm run build: clean
- npm test: 129/129 pass
- node -e "require('./package.json').version" -> 0.1.25
- node -e "require('./package-lock.json').version" -> 0.1.25

Co-authored-by: NagyVikt <nagy.viktordp@gmail.com>

Author: NagyVikt

package-lock.json

@@ -1,6 +1,6 @@
 {
   "name": "authmux",
-  "version": "0.1.24",
+  "version": "0.1.25",
   "description": "Multi-account auth multiplexer for AI CLI agents — Claude Code, Codex, Kiro CLI.",
   "license": "MIT",
   "bin": {

package.json

@@ -1,44 +1,132 @@
 # authmux v0.1.25
 
+Now-horizon release: themes **N1** (durability), **N2** (account-service
+split), **N3** (error taxonomy + `--json`), **N4** (lazy path resolvers),
+plus the **P0 wave** from the 18k-line improvement protocol.
+
 ## Added
-- `src/infra/fs/atomic-write.ts` — single durable file-write primitive with
-  fsync-before-rename and POSIX dir-fsync after rename, plus mode applied
-  before rename so 0600 files are never visible at a looser mode.
-- `src/infra/fs/registry-lock.ts` — advisory lock around `registry.json`
-  with PID-liveness probing plus a 30 s wall-clock stale-lock heuristic.
-- `persistRegistryAtomic` in `src/lib/accounts/registry.ts` is now the single
-  registry write path; it reloads under the lock and merges accounts so two
-  concurrent writers (daemon + interactive) no longer race-lose each other's
-  mutations.
-- `src/tests/registry-durability.test.ts` covers the SIGKILL-between-
-  writeFile-and-rename window and the stale-lock-reaping path.
+
+- **N1 — Atomic writes & registry lock.**
+  - `src/infra/fs/atomic-write.ts` — single durable file-write primitive
+    with `fsync`-before-rename, POSIX dir-fsync after rename, and mode
+    applied before rename so 0600 files are never visible at a looser mode.
+  - `src/infra/fs/registry-lock.ts` — `O_EXCL` advisory lock around
+    `registry.json` with PID-liveness probe plus 30 s wall-clock stale-lock
+    heuristic.
+  - `persistRegistryAtomic` in `src/lib/accounts/registry.ts` — single
+    registry write path; reloads under the lock and merges account entries
+    so two concurrent writers no longer race-lose each other's mutations.
+  - `src/tests/registry-durability.test.ts` — covers SIGKILL between
+    `writeFile` and `rename` plus the stale-lock-reaping path.
+- **N2 — `account-service.ts` decomposition.** 1675 LOC → 164 LOC
+  orchestrator backed by 12 focused modules under
+  `src/lib/accounts/{sync,read,write,config,auto-switch,usage,safety,session,identity}/`
+  plus 4 `_internal/` helpers. 31 new unit tests across the clusters.
+- **N3 — Error taxonomy.** `AuthmuxError` base class in
+  `src/lib/accounts/errors.ts` with stable `code`, `severity`, `hint`,
+  `details`, and `toJSON()`. Every existing error
+  (`AuthFileMissingError`, `AccountNotFoundError`,
+  `NoAccountsSavedError`, `InvalidAccountNameError`,
+  `AccountNameInferenceError`, `SnapshotEmailMismatchError`,
+  `PromptCancelledError`, `InvalidRemoveSelectionError`,
+  `AmbiguousAccountQueryError`, `AutoSwitchConfigError`) now carries an
+  `E_*` code. `src/tests/error-taxonomy.test.ts` enforces the §6.2 code
+  allowlist and §6.3 exit-code table.
+- **N3 — `--json` flag** on `list`, `current`, `status`, `use`, `save`.
+  Emits a single JSON envelope on stdout (`{ ok, data }` or
+  `{ ok, error: { code, severity, message, hint, details } }`).
+  Interactive prompts are skipped under `--json`.
+- **N4 — Lazy path resolver tests.** `src/tests/paths.test.ts` proves
+  env-var changes apply after module load.
+- **P0 — CI test matrix.** New GitHub Actions workflow runs `npm test`
+  across Ubuntu/macOS/Windows × Node 18/20/22 (previously only an LLM
+  review bot existed; `npm test` was never run in CI).
+- **Docs.** `docs/future/*` — 19 source-grounded improvement documents
+  (~18 016 lines) covering architecture, accounts, paths, config, daemon,
+  usage, hooks, multi-CLI, security, testing, release, observability,
+  cross-platform, perf, docs, roadmap, glossary.
 
 ## Changed
-- `secureWriteFile` now delegates to `atomicWriteFile`; behavior is the same
-  (atomic temp+rename, 0600 perms) but every snapshot, `current`, and
-  `sessions.json` write now also fsyncs the file and the containing directory
-  before returning.
-- `AccountService.useAccount` no longer calls `saveRegistry` directly; all
-  registry writes go through the locked `persistRegistry` path.
+
+- **N1.** `secureWriteFile` now delegates to `atomicWriteFile`; every
+  snapshot, `current`, and `sessions.json` write fsyncs the file and the
+  containing directory before returning.
+- **N1.** `AccountService.useAccount` no longer calls `saveRegistry`
+  directly; all registry writes route through the locked
+  `persistRegistry` path.
+- **N2.** `AccountService` is now a thin orchestrator (164 LOC). All 21
+  public method signatures preserved; the singleton in
+  `src/lib/accounts/index.ts` is byte-compatible.
+- **N3.** `BaseCommand` central error handler routes `AuthmuxError`
+  instances to the JSON envelope under `--json` and exits with the §6.3
+  exit code (`3` `E_AUTH_MISSING`, `4` `E_ACCOUNT_NOT_FOUND`,
+  `5` `E_SNAPSHOT_EMAIL_MISMATCH`, `6` `E_REGISTRY_LOCKED`,
+  `7` `E_REGISTRY_CORRUPT`, `8` `E_PROVIDER_NOT_INSTALLED`,
+  `64` `E_PROMPT_CANCELLED`, `1` generic).
+- **P0.** Init-hook update prompt flipped from `[Y/n]` (default-yes) to
+  `[y/N]` (default-no) in `src/hooks/init/update-notifier.ts`. Bare
+  `authmux` invocations no longer auto-install updates by default.
 
 ## Fixed
-- Half-written `registry.json` after SIGKILL or laptop sleep no longer
-  shadows the on-disk file: the rename is the commit point.
-- Concurrent `authmux daemon --watch` + `authmux use foo` mutations are
-  serialized through the registry lock.
+
+- **N1.** Half-written `registry.json` after SIGKILL or laptop sleep no
+  longer shadows the on-disk file; the rename is the commit point.
+- **N1.** Concurrent `authmux daemon --watch` + `authmux use <name>`
+  mutations are serialized through the registry lock.
+- **P0.** `registry.ts` sanitization no longer drops `"proxy"` as a
+  usage source; saved snapshots with `source: "proxy"` round-trip
+  correctly instead of being coerced to `"cached"`.
+- **P0.** `src/commands/kiro.ts` no longer throws `ENOENT` when the
+  target file does not exist (the `fs.existsSync(...) || fs.lstatSync(...).isSymbolicLink()`
+  short-circuit was inverted).
 
 ## Deprecated
-- None.
+
+- `codexDir`, `accountsDir`, `authPath`, `currentNamePath`,
+  `registryPath`, `sessionMapPath` in `src/lib/config/paths.ts` — the bare
+  eager constants. Use the `resolveX()` getters instead so env-var
+  overrides set after import are honored. Scheduled for removal in
+  **v0.2.0**.
 
 ## Removed
+
 - None.
 
 ## Security
-- File mode 0600 is applied to the temp file BEFORE the rename, closing the
-  brief window where the previous chmod-after-rename path could expose
-  freshly-renamed files at the umask default.
 
-## Durability
+- **0600 / 0700 perms.** `secureWriteFile` (now backed by
+  `atomicWriteFile`) applies file mode 0600 to the temp file *before*
+  the rename, closing the brief window where chmod-after-rename could
+  expose freshly-renamed snapshot, `current`, or `sessions.json` files at
+  the umask default. Accounts dir is created 0700.
+- **Atomic mode-before-rename** means there is no observable moment at
+  which a refresh-token file exists on disk at a looser mode than 0600.
+- **Default-no update prompt.** Flipping the init-hook update prompt to
+  `[y/N]` reduces the chance of accidental unattended updates triggered
+  by a bare `authmux` invocation in CI or scripts.
+
+## Migration
+
+No migration is required for end users. The on-disk layout of
+`registry.json`, `current`, `sessions.json`, and per-account snapshot
+files is unchanged.
+
+External library consumers of `src/lib/config/paths.ts` should switch
+from the bare constants (`codexDir`, `accountsDir`, `authPath`,
+`currentNamePath`, `registryPath`, `sessionMapPath`) to the resolver
+functions (`resolveCodexDir()`, `resolveAccountsDir()`, `resolveAuthPath()`,
+`resolveCurrentNamePath()`, `resolveRegistryPath()`,
+`resolveSessionMapPath()`) before **v0.2.0**.
+
+CLI consumers that grep stdout still work — human-readable `message`
+strings are unchanged. New scripts should prefer `--json` for stable
+parsing.
+
+---
+
+## Theme deep-dives
+
+### Durability (N1)
 
 This release closes the two data-loss windows tracked under Theme N1 of
 `docs/future/17-ROADMAP.md`:
@@ -48,19 +136,61 @@ This release closes the two data-loss windows tracked under Theme N1 of
    and (on POSIX) `fsync`s the containing directory. A power loss between
    any of these steps leaves the previous content of the target intact.
 2. **Concurrent-writer lost mutations.** `withRegistryLock` serializes
-   writers; `persistRegistryAtomic` reloads the registry under the lock and
-   merges accounts before writing so neither writer silently discards the
-   other.
+   writers; `persistRegistryAtomic` reloads the registry under the lock
+   and merges accounts before writing so neither writer silently discards
+   the other.
 
-Crash-safety guarantees promised after this release match the table in
+Crash-safety guarantees match the table in
 `docs/future/01-ARCHITECTURE.md` §5.3 rows 1, 2, and 4.
 
 `fsync` adds latency on spinning disks; on SSDs it is dominated by the
-network/parse work the CLI was already doing and is not user-visible. The
-dir-fsync is gated on `process.platform !== "win32"` because Windows does
-not allow opening a directory as a file.
+network/parse work the CLI was already doing and is not user-visible.
+The dir-fsync is gated on `process.platform !== "win32"` because Windows
+does not allow opening a directory as a file.
 
-## Migration
+### Account-service split (N2)
+
+| Module | LOC | Cluster |
+| --- | --- | --- |
+| `sync/external-sync.ts` | 216 | external-auth sync orchestrator |
+| `read/listing.ts` | 211 | listings + `getCurrentAccountName` + find |
+| `write/save.ts` | 159 | `saveAccount` + safety guard + name inference |
+| `write/use.ts` | 128 | `useAccount` + `activateSnapshot` |
+| `write/remove.ts` | 105 | remove one / by-query / all |
+| `config/auto-switch-config.ts` | 82 | status + threshold setters |
+| `auto-switch/policy.ts` | 141 | `runAutoSwitchOnce` + `runDaemon` |
+| `usage/adapter.ts` | 192 | refresh + proxy shim |
+| `safety/snapshot-vault.ts` | 125 | backup vault + clobber recovery |
+| `session/pin.ts` | 243 | sessions.json I/O + Linux PPID heuristic |
+| `identity/equality.ts` | 86 | snapshot identity comparisons (pure) |
+| `naming.ts` | 40 | `normalizeAccountName` + `accountFilePath` |
+
+Orchestrator `account-service.ts`: **164 LOC** (was 1675; ceiling was
+400 per N2 exit criteria).
+
+### Error taxonomy & --json (N3)
+
+JSON envelope shape:
+
+```jsonc
+// success
+{ "ok": true, "data": { /* command-specific payload */ } }
+
+// error
+{ "ok": false,
+  "error": { "code": "E_ACCOUNT_NOT_FOUND", "severity": "fatal",
+             "message": "...", "hint": "...",
+             "details": { "name": "alice" } } }
+```
+
+`CodexAuthError` is preserved as a back-compat subclass of
+`AuthmuxError` so existing `instanceof CodexAuthError` catches continue
+to work.
+
+### Lazy path resolvers (N4)
 
-No migration is required. The on-disk layout of `registry.json`, `current`,
-`sessions.json`, and the per-account snapshot files is unchanged.
+The bare exports in `src/lib/config/paths.ts` were evaluated at module
+import time, so env-var overrides set after the first `import` had no
+effect. The `resolveX()` getters re-read the environment on every call;
+all internal call sites already use them. The bare constants are kept
+through one release for external consumers.