* refactor(query): extract phase lifecycle policy module
* refactor(query): extract phase fs and roadmap mutation adapters
* fix(sdk): propagate non-ENOENT readdir errors in phase-filesystem-adapter (CR finding 1)
Swallow only ENOENT in listDirectories; rethrow EACCES, EIO, and other
unexpected errors so callers surface real failures rather than silently
treating a permission-denied phases dir as empty.
Also adds regression test: EACCES from readdir now propagates as thrown
error instead of returning [].
* fix(sdk): propagate non-ENOENT readFile errors in phase-roadmap-mutation (CR finding 4)
readModifyWriteRoadmapMd now falls back to empty content only on ENOENT;
EACCES, EIO, and other errors are rethrown so a subsequent write cannot
clobber real roadmap content that is temporarily unreadable.
Regression tests: EACCES propagates; absent ROADMAP.md still starts empty.
* fix(sdk): omit Depends on: Phase 0 for first sequential phase; align prefix grammar (CR findings 2+3)
Finding 2: buildPhaseRoadmapEntry now omits the "Depends on" line when
phaseId == 1 (prevPhase would be 0, which is not a valid predecessor).
The guard is `prevPhase < 1` so future phase-0 configs are also safe.
Finding 3: collectDecimalSuffixesFromDirNames regex prefix pattern
updated from `[A-Z]{1,6}` to `[A-Z][A-Z0-9]*` (case-insensitive flag
added), matching the grammar used by scanSequentialMaxPhaseFromDirs.
Prevents k014 parity drift for alphanumeric project-code prefixes longer
than six characters or containing digits.
Regression tests for both fixes included.
