test(e2e): add scenarios 42-44 covering consistency-fix, rollout strategy, and components reserve

[joshua-temple]

Problem

Three feature-coverage gaps from epic #412 had no e2e regression guards:

• Gap feat: first-class cross-repo deploy targets (GitOps mirror pattern) #2: status consistency --fix had no e2e scenario verifying the orphan-branch delete path
• Gap feat: vendor-neutral metrics emission for orchestrate and promote runs #3: the rollout max_parallel/fail_fast generator path had no assertion test
• Gap feat: starter template / cascade init scaffold #4: the components reserve field (feat: independently versioned components in a single manifest #176) had no parse/generate smoke test (and its JSON schema entry was missing)

Fix

Scenario 42 (42-status-consistency-fix.yaml): seeds a diverged env/prod branch (state ref: set) and an orphan env/dev branch (no manifest divergence), runs cascade status consistency --fix, then asserts via git ls-remote --heads origin inside the act container that env/dev is deleted and env/prod is untouched. Confirmed --fix is strictly git (git push <remote> --delete) with no GitHub API path.

Scenario 43 (43-deploy-rollout-strategy.yaml): manifest sets rollout.max_parallel: 2 and rollout.fail_fast: true on a deploy with an inputs map (required for the matrix path where the strategy block renders). Asserts promote.yaml contains fail-fast: true and max-parallel: 2.

Scenario 44 (44-components-reserved.yaml): mirrors the 23-26 reserved-shape pattern for the components reserve. Fixes the missing JSON schema entry (componentConfig definition + components property) so the field passes schema validation; also regenerates both distribution schema copies.

Gap #5 (auto-promote handoff): assessed only. The resolve/full-run logic is entirely shell in .github/workflows/auto-promote.yaml (artifact download, regex matching, gh api tag lookup, ${RC%-rc.*} suffix stripping). No Go backs it. Faithful coverage requires a real GitHub Actions run with a real rc tag and a completed fleet run. Left for the fleet track.

Verification

• Scenario 42 Status_Consistency_Fix_Deletes_Orphan_Env_Branch: PASS (22.66s, Docker)
• Scenario 43 Deploy_Rollout_Strategy_Options: PASS (21.40s, Docker)
• Scenario 44 Components_Reserved_Shape: PASS (21.43s, Docker)
• go build ./...: exit 0
• go test ./...: exit 0
• golangci-lint run ./...: exit 0 (0 issues)
• e2e: go build ./... && go vet ./...: exit 0