* docs: add orchestration plan + spec for homebrew release fix

- ORCHESTRATE-homebrew-release-fix.md (4-phase implementation plan)
- SPEC-homebrew-release-fix-2026-02-21.md (full spec from brainstorm)
- BRAINSTORM-homebrew-release-fix-2026-02-21.md (deep feat brainstorm)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* chore: delete 62 stale root-level files

Remove 54 planning/summary docs and 8 old test scripts, debug helpers,
VS Code workspace, and eslint config from repo root.

These files inflate the Homebrew tarball (74MB) but are not needed at
runtime. Keeping package.json (husky/lint-staged) and essential docs.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* fix: Homebrew formula selective install — reduce 74MB to ~4MB

Replace `prefix.install Dir["*"]` with explicit allowlist of runtime
directories and essential docs. Excludes tests/, docs/, .github/,
node_modules artifacts, and planning docs from the Cellar.

Installed: lib/, commands/, completions/, hooks/, setup/, scripts/,
config/, plugins/, zsh/, flow.plugin.zsh, README, CHANGELOG, LICENSE

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* ci: add version guard — block release on FLOW_VERSION mismatch

New workflow triggers on release creation. Extracts tag version and
FLOW_VERSION from flow.plugin.zsh, fails with clear error message
if they don't match. Uses env vars for injection-safe expression handling.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* chore: bump version to 7.4.1

Update FLOW_VERSION, package.json, CLAUDE.md, CHANGELOG, and .STATUS
for the Homebrew cleanup release.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* chore: remove orchestration plan (merge cleanup)

ORCHESTRATE files are working artifacts for feature branches,
removed before merge to dev per workflow convention.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* fix: portable grep in version guard, clarify formula SHA256, fix test count

- Replace grep -oP (GNU-only) with grep -oE (POSIX) in version-guard workflow
- Add comment explaining placeholder SHA256 in local Formula
- Fix test count in .STATUS: 45/45 (not 47/47)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

---------

Co-authored-by: Test User <test@example.com>
Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

Update 14 files: version footers v7.4.0 → v7.4.1, test count 47 → 45,
add v7.4.1 CHANGELOG entry (Homebrew fix, version guard, repo cleanup).

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>