fix(08.1-06): sync __version__ to 0.2.5a1 + accept PEP 440 alpha suffixes in managed-block markers

The package's runtime __version__ in src/supamem/__init__.py had drifted
to 0.2.1 (last bumped manually two release lines ago); pyproject.toml
was the only updated source. `supamem --version` reported 0.2.1 even
on the freshly-built 0.2.5a1 wheel. Sync to match pyproject.

While re-smoking, the version bump exposed a second bug: the managed-
block fence regex in config_io._FENCE_RE / _BEGIN_RE and doctor._VERSION_RE
matched only `v[\d\.]+`, which rejects PEP 440 pre-release versions
that contain letters (e.g. 0.2.5a1, 1.0.0rc2, 2.1.dev0). Effect:
`supamem install` was no-longer idempotent on alpha versions — the
second run could not find the existing block and appended a duplicate
to ~/CLAUDE.md.

Widen the char-class to `[\w\.\+\-]+` (covers PEP 440 letters,
digits, dots, plus, minus, underscore — full release-segment shape).
Both fence-pair detection and doctor's drift probe now round-trip
cleanly across alpha releases. Confirmed by:

- tests/test_install_claude_code.py + test_install_opencode.py: green
- uv run pytest -q: 504 passed, 1 skipped
- Fresh-venv smoke: `supamem --version` reports 0.2.5a1; second
  `install()` is a true no-op (no duplicate managed block)

Auto-fix per gsd-execute-phase Rule 1 (bug discovered during release
smoke; fix is in-scope for the version bump that exposed it).

Author: dzmitrys-dev

src/supamem/__init__.py

@@ -1,2 +1,2 @@
 """supamem — project-agnostic dual-memory tooling."""
-__version__ = "0.2.1"
+__version__ = "0.2.5a1"

src/supamem/config_io.py

@@ -176,13 +176,17 @@ def atomic_write_json(
 
 _BEGIN_FMT = "# BEGIN SUPAMEM v{version} MANAGED BLOCK — DO NOT EDIT"
 _END_FMT = "# END SUPAMEM v{version} MANAGED BLOCK"
+# PEP 440 versions can include alpha/beta/rc/dev suffixes (e.g. 0.2.5a1,
+# 1.0.0rc2, 2.1.dev0), so the marker version-token char-class must accept
+# letters, digits, dots, plus, minus, and underscore — not just `[\d\.]+`.
+# Anchor with leading `v` to keep the marker unambiguous.
 _FENCE_RE = re.compile(
-    r"# BEGIN SUPAMEM v[\d\.]+ MANAGED BLOCK — DO NOT EDIT\n"
+    r"# BEGIN SUPAMEM v[\w\.\+\-]+ MANAGED BLOCK — DO NOT EDIT\n"
     r"(?P<owned>.*?)\n"
-    r"# END SUPAMEM v[\d\.]+ MANAGED BLOCK",
+    r"# END SUPAMEM v[\w\.\+\-]+ MANAGED BLOCK",
     re.DOTALL,
 )
-_BEGIN_RE = re.compile(r"# BEGIN SUPAMEM v[\d\.]+ MANAGED BLOCK — DO NOT EDIT")
+_BEGIN_RE = re.compile(r"# BEGIN SUPAMEM v[\w\.\+\-]+ MANAGED BLOCK — DO NOT EDIT")
 
 
 def wrap_managed_block(content: str, version: str = __version__) -> str:

src/supamem/doctor.py

@@ -36,7 +36,8 @@ def _client_targets() -> tuple[tuple[str, Path], ...]:
         ("opencode", Path.home() / "AGENTS.md"),
     )
 
-_VERSION_RE = re.compile(r"BEGIN SUPAMEM v([\d\.]+) MANAGED BLOCK")
+# PEP 440 versions accept alpha/beta/rc/dev suffixes; matches config_io._FENCE_RE.
+_VERSION_RE = re.compile(r"BEGIN SUPAMEM v([\w\.\+\-]+) MANAGED BLOCK")
 
 
 def _redact(value: str, *, enabled: bool) -> str: