Architect-approved (C): install.sh now skips+aborts (exit 0) when the
installed version equals the current git-derived version, with a --force
flag to re-install. Version scheme 0.0cN (N = git commit count) bumps by
construction on every commit.
- install_version(): derives 0.0c$count via git rev-list; empty when .git
absent (gate skipped); INSTALL_VERSION_OVERRIDE presence-check seam for
tests (empty override simulates no-git deterministically)
- Gate after arg parse, before phases; numeric comparison (strip 0.0c, -eq);
messages: 'Already installed (X). Use --force to re-install.' and
'(dry-run) Would skip install: already at version X', both exit 0
- flag_set installed_version after 'Bootstrap complete' banner (not in
dry-run, even under --force, never on phase failure)
- Docs: SCRIPTS.md flag table + gate description, AGENT_Context line count
248->301 + flags + flow diagram, README --force row, tests/README row,
AGENT_TODO Done entry
Verified: new tests/t-install-version.sh 21 checks (9 contracted cases,
real install.sh + hermetic env seams); suite 20 files / 461 checks /
0 fail / 0 skip; make gen byte-idempotent; make check OK; make lint
0 FAIL, 0 WARN; bash -n clean; git diff --check clean; Reviewer
APPROVE_WITH_NOTES with 3 mutation disproofs (8/21, 9/21, 4/21 fail)
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