feat: ADF metrics recalibration, CI hardening, and release workflow

[SmartBrandStrategies]

Summary

• charter adf metrics recalibrate — new subcommand to re-measure LOC from manifest metric sources, propose new ceilings with configurable headroom, and update baselines/ceilings with required rationale (--reason or --auto-rationale).
• Stale baseline detection — charter adf evidence now detects stale metric baselines, emits structured staleBaselines warnings, and suggests recalibration actions.
• Release workflow — new .github/workflows/release.yml supports automatic GitHub Releases on v* tag push and manual workflow_dispatch backfill for historical tags.
• CI fixes — resolved 5 pre-existing CI failures: pnpm version conflict, build/typecheck ordering, npm→pnpm in governance workflow, missing file guards for docs:check and drift scan.
• README update — removed large ADF architecture PNG, updated SDLC status callout.

Scope

• @stackbilt/cli
• Docs only

Validation

• ADF verification passed (pnpm run verify:adf)
• All 4 CI checks green (CI, Governance Check x2, Governance Scorecard)

Compatibility

• No breaking changes

Agent Contract Impact

• JSON output/exit-code behavior changed (documented in README.md + CHANGELOG.md)

Details: adf evidence now includes staleBaselines in JSON output. New adf metrics recalibrate command added.

Screenshots / Output Samples

Constraints:
  [ok] adf_commands_loc: 581 / 650 [lines] -- PASS
  [ok] adf_bundle_loc: 185 / 200 [lines] -- PASS
  [ok] adf_sync_loc: 219 / 250 [lines] -- PASS
  [ok] adf_evidence_loc: 328 / 380 [lines] -- PASS
  [ok] adf_migrate_loc: 453 / 500 [lines] -- PASS
  [ok] bundler_loc: 415 / 500 [lines] -- PASS
  [ok] parser_loc: 214 / 300 [lines] -- PASS
  [ok] cli_entry_loc: 197 / 200 [lines] -- PASS

Verdict: PASS