fix(agent-mention): enforce repository_dispatch property cap on current main

[seonghobae]

Purpose

Replace stale/diverged #910 with the same root-cause repair on current protected-main source. GitHub repository dispatch accepts at most 10 top-level client_payload properties. The protected-main OpenCode mention route carried 14 on the router→wrapper hop, so an authorized mention could be rejected before the trusted wrapper ran.

Exact current identity

• base branch: main;
• base at branch creation: 6eb06cdd08c79a06f7b390069d4ffa49e2eb7dba;
• exact current head: 4e6ecf5c7e0dc88db8f75b8b1faaf9beeb6e1d9b;
• Draft while exact-head security/supply-chain review and independent approval remain incomplete;
• fix(agent-mention): keep OpenCode dispatch payload under 10-property limit #910 remains the stale historical implementation line and is not a merge candidate.

Root-cause contract

The durable invocation claim still binds repository, PR, exact head/base, base branch, source comment, requesting actor, requested agent, and the five immutable review-only controls:

• trigger_reviews=true;
• review_dispatch_limit="1";
• enable_auto_merge=false;
• update_branches=false;
• merge_mode="disabled".

Transport is narrower than authority binding:

1. router→trusted OpenCode wrapper carries exactly nine identity/claim fields, staying under GitHub's ten-property boundary;
2. the trusted wrapper reconstructs the five fixed controls and recomputes the complete invocation digest before durable-ledger access;
3. wrapper→authoritative merge-scheduler carries exactly ten scheduler fields and omits wrapper-only identities;
4. the durable exact-name Actions artifact ledger continues to bind the complete canonical claim, so payload shrinking does not weaken idempotency or review-only policy.

No mutable caller-selected review/merge controls, secret, reviewer authority, or branch-write capability is added.

TDD evidence

Initial RED head 02a86f342ff779145ae7d023c7f096ede4148b04 added the permanent property-cap contract. Agent Mention Router Quality CI reproduced the defect against protected-main behavior: OpenCode initial payload had five extra behavior properties beyond the allowed identity set.

After the current-main router/wrapper repair, exact head f0bb2b75283fe56f3d5cce1e82885fca7b0a4996 exposed one stale pre-existing test that still expected the old 14-property transport. That was a test-contract mismatch, not a production rollback requirement. The current head updates that expectation while separately asserting the full canonical claim still contains all five fixed review-only controls.

At exact current head 4e6ecf5c7e0dc88db8f75b8b1faaf9beeb6e1d9b, Agent Mention Router Quality CI completed successfully. Scorecard PR also completed successfully at the latest refresh; CodeQL, Python Security, Security Scan, SAST Semgrep, Secret Scan, OSV-Scanner PR, and SBOM Generation were queued or pending at that observation and therefore are not counted as passing until complete.

Supersession / acceptance

Do not close #910 until this current-main successor has complete exact-head machine/security evidence and the stale lineage can be preserved without ambiguity. Do not mark Ready or merge until current automated source review, zero valid unresolved findings, a qualifying independent non-author formal approval, independently resolved live-base compatibility, and branch protection are satisfied.

After protected integration, exercise an authorized OpenCode mention through the real router→wrapper→scheduler path and require a durable exact-name invocation artifact plus review-only downstream behavior. Predecessor or local-only evidence does not close that operational scenario.

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Review details

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: 20016dae-42d6-4aee-9d5a-522fea818a1c

📥 Commits

Reviewing files that changed from the base of the PR and between 6eb06cd and 4e6ecf5.

📒 Files selected for processing (4)

• .github/workflows/agent-mention-opencode-dispatch.yml
• scripts/ci/agent_mention_router.py
• tests/test_agent_mention_complete_payload_binding.py
• tests/test_agent_mention_router.py

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[seonghobae]

@coderabbitai review

Please perform a fresh semantic source review of unchanged exact head 4e6ecf5c7e0dc88db8f75b8b1faaf9beeb6e1d9b against live protected base 6eb06cdd08c79a06f7b390069d4ffa49e2eb7dba. All nine exact-head workflows are terminal-success, the branch is zero commits behind, and no formal review or unresolved thread currently exists. Keep Draft; this request is source-review evidence only and is not merge approval or protected-main acceptance.

[coderabbitai]

@seonghobae I will perform a fresh semantic source review of exact head 4e6ecf5c7e0dc88db8f75b8b1faaf9beeb6e1d9b against base 6eb06cdd08c79a06f7b390069d4ffa49e2eb7dba. I will keep #911 as Draft. This action does not approve the pull request or indicate protected-main acceptance.

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