fix(sync): bind full promotion to canary source

[stranske]

Why

The full-plan rollout from Workflows #3120 proved canary and promotion against source commit c2e1007a7513199e329c4b80e0ccf3e98fccfe69, but automatic promotion fell back to the later workflow ref 7aec1c6b059939d37e5091e8b716c4d038d4d867. Maint 71 then correctly failed the mixed-source campaign.

Scope

Bind every promotion to the unique source commit in Maint 71 canary evidence. Continue reconstructing the base SHA only for source-delta plans, reject explicit/evidence scope mismatches, and reject full-plan evidence carrying a source-range base.

Tasks

• Make promotion evidence authoritative for the source commit in full and source-delta plans.
• Add a behavioral regression test using a later simulated GITHUB_SHA.
• Update the sync delivery contract documentation.

Acceptance Criteria

• A full-plan promotion checks out the exact canary-authorized source commit even when main has advanced.
• Source-delta promotion retains exact base/head reconstruction.
• Mixed or contradictory evidence fails closed.
• Relevant workflow tests and actionlint pass.

Validation

• python3 -m pytest -q tests/workflows/test_sync_manifest_delivery.py tests/workflows/test_sync_delivery_liveness.py — 18 passed
• actionlint .github/workflows/maint-68-sync-consumer-repos.yml — passed
• ruff check tests/workflows/test_sync_manifest_delivery.py — passed
• git diff --check — passed

Rollout

After merge, rerun Maint 68 as an exact no-filter canary from this merge commit, collect Maint 71 exact-plan evidence, promote, complete the campaign, run Health 83, and verify the non-admin owned fleet is empty.

Source: sync/maintenance campaign following Workflows #3120 and Maint 71 run 31950591613.

Summary by CodeRabbit

• Improvements

  • Promotion now uses the exact source commit and immutable source range authorized during canary validation.
  • Delivery plans preserve transitive manifest requirements and prevent later source changes from being included.
  • Scope and evidence mismatches are detected, including invalid mixed or incomplete promotion data.
  • Automatic scope defaults to a full plan only when no promotion evidence is provided.

• Documentation

  • Updated workflow and maintenance guidance to describe source-commit recovery, immutable bases, and transitive requirements.

• Tests

  • Added coverage confirming full-plan promotions retain the canary-authorized source commit.

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Review details

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: ASSERTIVE

Plan: Pro

Run ID: 98df7d39-ba28-43b1-a9bd-dff7886a9c3c

📥 Commits

Reviewing files that changed from the base of the PR and between ef35a72 and af10269.

📒 Files selected for processing (2)

• .github/workflows/maint-68-sync-consumer-repos.yml
• tests/workflows/test_sync_manifest_delivery.py

📝 Walkthrough

Walkthrough

Promotion now derives plan scope, source commit, and base SHA from validated canary evidence. It rejects inconsistent evidence and preserves the authorized historical source state. Tests and documentation cover the updated promotion contract.

Changes

Promotion evidence binding

Layer / File(s)	Summary
Resolve and validate promotion evidence .github/workflows/maint-68-sync-consumer-repos.yml	The workflow validates canary scope, source commit, and base SHA values before applying defaults. It rejects mismatches and invalid full-plan or source-delta evidence. SHA normalization uses portable shell commands.
Verify and document the promotion contract tests/workflows/test_sync_manifest_delivery.py, docs/WORKFLOW_GUIDE.md, docs/ops/CONSUMER_REPO_MAINTENANCE.md, docs/ci/WORKFLOWS.md	The regression test verifies preservation of the canary source commit. Documentation describes historical source reconstruction, immutable bases, and transitive requires targets.

Estimated code review effort: 3 (Moderate) | ~25 minutes

Merge Risk: 🟠 High · up to ef35a

Promotion can still run against a commit that was not authorized by canary evidence when that evidence is missing, reintroducing mixed-source deployment behavior. This is a merge-blocking correctness risk until promotion requires valid canary evidence.

Sequence Diagram(s)

sequenceDiagram
  participant Maint71CanaryEvidence
  participant Maint68PromotionWorkflow
  participant SourceRepository
  Maint71CanaryEvidence->>Maint68PromotionWorkflow: provide scope, source commit, and base SHA
  Maint68PromotionWorkflow->>Maint68PromotionWorkflow: validate evidence and resolve plan scope
  Maint68PromotionWorkflow->>SourceRepository: check out the recorded source commit
  SourceRepository-->>Maint68PromotionWorkflow: provide historical source state
  Maint68PromotionWorkflow->>Maint68PromotionWorkflow: recompile the authorized plan

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Possibly related PRs

• stranske/Workflows#2965: Produces the Maint 71 canary evidence consumed by this promotion flow.
• stranske/Workflows#3039: Updates the same workflow and delivery tests for canary-authorized promotion.
• stranske/Workflows#3118: Defines the canary handoff contract for scope, source commit, and immutable base evidence.

Suggested labels: verify:compare, codex-automation

Suggested reviewers: codex-automation

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the main change: binding full promotion to the canary-authorized source commit.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

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• Commit unit tests in branch codex/fix-full-promotion-source-binding

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[stranske-keepalive]

Automated Status Summary

Head SHA: 9ec471f
Latest Runs: ⏳ pending — Gate
Required contexts: summary
Required: core tests (3.12): ⏳ pending, core tests (3.13): ⏳ pending, docker smoke: ⏳ pending, gate: ⏳ pending

Workflow / Job	Result	Logs
(no jobs reported)	⏳ pending	—

Coverage Overview

• Coverage history entries: 1

Coverage Trend

Metric	Value
Current	76.26%
Baseline	85.00%
Delta	-8.74%
Minimum	70.00%
Status	✅ Pass

Top Coverage Hotspots (lowest coverage)

File	Coverage	Missing
scripts/issue_dedup_smoke.py	0.0%	4
scripts/runner_lib/__main__.py	0.0%	3
scripts/validate_template_sync.py	0.0%	81
scripts/langchain/topic_splitter.py	19.1%	57
tools/codex_log_analyzer.py	19.6%	140
scripts/repo_review_round2_runner.py	25.1%	344
scripts/prune_agent_stubs.py	39.7%	26
scripts/repo_review_round1_runner.py	40.7%	133
tools/ensure_workflow_timeout_variables.py	42.1%	74
scripts/sync_label_docs.py	42.9%	64
tools/discover_model_catalog.py	44.8%	55
scripts/repo_review_backlog_scan.py	45.3%	116
scripts/repo_review_body_writer.py	46.5%	86
tools/codex_session_analyzer.py	47.9%	59
scripts/create_verifier_labels.py	48.3%	58

Low Coverage Files (<50.0%)

File	Coverage	Missing
scripts/issue_dedup_smoke.py	0.0%	4
scripts/runner_lib/__main__.py	0.0%	3
scripts/validate_template_sync.py	0.0%	81
scripts/langchain/topic_splitter.py	19.1%	57
tools/codex_log_analyzer.py	19.6%	140
scripts/repo_review_round2_runner.py	25.1%	344
scripts/prune_agent_stubs.py	39.7%	26
scripts/repo_review_round1_runner.py	40.7%	133
tools/ensure_workflow_timeout_variables.py	42.1%	74
scripts/sync_label_docs.py	42.9%	64
tools/discover_model_catalog.py	44.8%	55
scripts/repo_review_backlog_scan.py	45.3%	116
scripts/repo_review_body_writer.py	46.5%	86
tools/codex_session_analyzer.py	47.9%	59
scripts/create_verifier_labels.py	48.3%	58

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Keepalive checklist

Scope

No scope information available

Tasks

• No tasks defined

Acceptance criteria

• No acceptance criteria defined

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Actionable comments posted: 2

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Inline comments:
In @.github/workflows/maint-68-sync-consumer-repos.yml:
- Line 119: Update the promotion handling condition around REQUESTED_PHASE and
CANARY_EVIDENCE_JSON so every phase=promote request requires nonempty canary
evidence before applying scope defaults; do not allow empty evidence to fall
through to the full-scope/GITHUB_SHA fallback in the later selection logic.

In `@tests/workflows/test_sync_manifest_delivery.py`:
- Around line 291-345: Expand the command-level tests around “Resolve immutable
plan scope” to reject explicit scope conflicts, missing or mixed source_commit
values, missing or mixed source-delta bases, and full-plan evidence containing
scope_base_sha. Add regression cases asserting nonzero execution and the
appropriate rejection for each invalid evidence set, while preserving the
existing successful full-plan promotion test.

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Review profile: ASSERTIVE

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📥 Commits

Reviewing files that changed from the base of the PR and between 7aec1c6 and ef35a72.

📒 Files selected for processing (5)

• .github/workflows/maint-68-sync-consumer-repos.yml
• docs/WORKFLOW_GUIDE.md
• docs/ci/WORKFLOWS.md
• docs/ops/CONSUMER_REPO_MAINTENANCE.md
• tests/workflows/test_sync_manifest_delivery.py

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[github-actions]

Provider Comparison Report

Provider Summary

Provider	Model	Verdict	Confidence	Summary
openai	gpt-5.6-terra	PASS	94%	The workflow now requires canary evidence for every promotion and treats that evidence as authoritative for the source commit, including full-plan promotions. It rejects absent, mixed, or contradic...
anthropic	claude-sonnet-5	PASS	78%	The workflow fix directly addresses the reported bug: previously, when scope wasn't 'auto', the script skipped extracting the authoritative source_commit/base_sha from canary evidence entirely, all...

📋 Full Provider Details (click to expand)

openai

• Model: gpt-5.6-terra
• Verdict: PASS
• Confidence: 94%
• Scores:
  • Correctness: 10.0/10
  • Completeness: 10.0/10
  • Quality: 9.0/10
  • Testing: 9.0/10
  • Risks: 9.0/10
• Summary: The workflow now requires canary evidence for every promotion and treats that evidence as authoritative for the source commit, including full-plan promotions. It rejects absent, mixed, or contradictory scope/source evidence; source-delta promotions continue to reconstruct and require the exact evidence base and head; and full-plan evidence is explicitly rejected if it includes a source-range base. This prevents fallback to the later dispatch workflow GITHUB_SHA when main advances. The added behavioral regression coverage targets the advanced-GITHUB_SHA case, and the documentation updates align the delivery contract with the new evidence-authoritative behavior. The implementation is clear, fails closed, and introduces no material security or compatibility concern.

anthropic

• Model: claude-sonnet-5
• Verdict: PASS
• Confidence: 78%
• Scores:
  • Correctness: 9.0/10
  • Completeness: 9.0/10
  • Quality: 8.0/10
  • Testing: 7.0/10
  • Risks: 8.0/10
• Summary: The workflow fix directly addresses the reported bug: previously, when scope wasn't 'auto', the script skipped extracting the authoritative source_commit/base_sha from canary evidence entirely, allowing a later GITHUB_SHA to leak into a full-plan promotion. The rewritten logic now always requires evidence during promote, derives (or validates) scope from evidence uniformly, unconditionally overrides source_commit from evidence for both full and source-delta scopes, validates full-plan evidence has no stray scope_base_sha, and fails closed on any mismatch between requested scope and evidence scope. This matches all four acceptance criteria. The ${var,,} → tr change is a sensible portability improvement. Documentation updates align with the 'update sync delivery contract' task, and a new 178-line test file was added, and CI (including actionlint/YAML validation and repo test suites) passed on the merge commit. Confidence is slightly limited only by not having full visibility into the added test file's contents due to diff truncation, but combined with passing CI and PR checklist completion, this appears to be a correct, complete, and low-risk fix.
• Concerns:
  • The full diff for the new test file (tests/workflows/test_sync_manifest_delivery.py) was truncated in the review context, so exact assertion coverage for the 'later GITHUB_SHA' regression scenario could not be directly inspected — relying on CI green + task checklist as corroborating evidence.
  • The refactored bash block is dense (nested jq queries with error() calls); while functionally correct, it could benefit from extracted helper functions or comments summarizing the state machine to ease future maintenance.
  • Downstream 'case "$scope" in ...' block (not fully shown due to diff truncation) was assumed unchanged; if it has implicit fallback behavior for non-promote paths, that combination wasn't verified end-to-end here.

Agreement

• Verdict: PASS (all providers)
• Correctness: scores within 1 point (avg 9.5/10, range 9.0-10.0)
• Completeness: scores within 1 point (avg 9.5/10, range 9.0-10.0)
• Quality: scores within 1 point (avg 8.5/10, range 8.0-9.0)
• Risks: scores within 1 point (avg 8.5/10, range 8.0-9.0)

Disagreement

Dimension	openai	anthropic
Testing	9.0/10	7.0/10

Unique Insights

• openai: The workflow now requires canary evidence for every promotion and treats that evidence as authoritative for the source commit, including full-plan promotions. It rejects absent, mixed, or contradictory scope/source evidence; source-delta promotions continue to reconstruct and require the exact ev...
• anthropic: The full diff for the new test file (tests/workflows/test_sync_manifest_delivery.py) was truncated in the review context, so exact assertion coverage for the 'later GITHUB_SHA' regression scenario could not be directly inspected — relying on CI green + task checklist as corroborating evidence.; The refactored bash block is dense (nested jq queries with error() calls); while functionally correct, it could benefit from extracted helper functions or comments summarizing the state machine to ease future maintenance.; Downstream 'case "$scope" in ...' block (not fully shown due to diff truncation) was assumed unchanged; if it has implicit fallback behavior for non-promote paths, that combination wasn't verified end-to-end here.

🔍 LangSmith Traces

• openai
• anthropic