chore: merge devsecops into main (#546)

* fix(workflows): standardize runner configuration for security jobs

* ci(actionlint): add Blacksmith runner label to config

Add blacksmith-2vcpu-ubuntu-2404 to actionlint self-hosted-runner labels config
to suppress "unknown label" warnings during workflow linting.

This label is used across all workflows after the Blacksmith migration.

* fix(actionlint): adjust indentation for self-hosted runner labels

* feat(security): enhance security workflow with CodeQL analysis steps

* fix(security): update CodeQL action to version 4 for improved analysis

* fix(security): remove duplicate permissions in security workflow

* fix(security): revert CodeQL action to v3 for stability

The v4 version was causing workflow file validation failures.
Reverting to proven v3 version that is working on main branch.

* fix(security): remove duplicate permissions causing workflow validation failure

The permissions block had duplicate security-events and actions keys,
which caused YAML validation errors and prevented workflow execution.

Fixes: workflow file validation failures on main branch

* fix(security): remove pull_request trigger to reduce costs

* fix(security): restore PR trigger but skip codeql on PRs

* fix(security): resolve YAML syntax error in security workflow

* refactor(security): split CodeQL into dedicated scheduled workflow

* fix(security): update workflow name to Rust Package Security Audit

* fix(codeql): remove push trigger, keep schedule and on-demand only

* feat(codeql): add CodeQL configuration file to ignore specific paths

* Potential fix for code scanning alert no. 39: Hard-coded cryptographic value

Co-authored-by: Copilot Autofix powered by AI <62310815+github-advanced-security[bot]@users.noreply.github.com>

* fix(ci): resolve auto-response workflow merge markers

* fix(build): restore ChannelMessage reply_target usage

* ci(workflows): run workflow sanity on workflow pushes for all branches

* ci(workflows): rename auto-response workflow to PR Auto Responder

* ci(workflows): require owner approval for workflow file changes

---------

Co-authored-by: Copilot Autofix powered by AI <62310815+github-advanced-security[bot]@users.noreply.github.com>

docs/ci-map.md

@@ -10,6 +10,7 @@ Merge-blocking checks should stay small and deterministic. Optional checks are u
 
 - `.github/workflows/ci.yml` (`CI`)
     - Purpose: Rust validation (`cargo fmt --all -- --check`, `cargo clippy --locked --all-targets -- -D clippy::correctness`, strict delta lint gate on changed Rust lines, `test`, release build smoke) + docs quality checks when docs change (`markdownlint` blocks only issues on changed lines; link check scans only links added on changed lines)
+    - Additional behavior: PRs that change `.github/workflows/**` require at least one approving review from a login in `WORKFLOW_OWNER_LOGINS` (repository variable fallback: `theonlyhennygod,willsarg`)
     - Merge gate: `CI Required Gate`
 - `.github/workflows/workflow-sanity.yml` (`Workflow Sanity`)
     - Purpose: lint GitHub workflow files (`actionlint`, tab checks)
@@ -39,7 +40,7 @@ Merge-blocking checks should stay small and deterministic. Optional checks are u
     - Additional behavior: risk + size labels are auto-corrected on manual PR label edits (`labeled`/`unlabeled` events); apply `risk: manual` when maintainers intentionally override automated risk selection
     - High-risk heuristic paths: `src/security/**`, `src/runtime/**`, `src/gateway/**`, `src/tools/**`, `.github/workflows/**`
     - Guardrail: maintainers can apply `risk: manual` to freeze automated risk recalculation
-- `.github/workflows/auto-response.yml` (`Auto Response`)
+- `.github/workflows/auto-response.yml` (`PR Auto Responder`)
     - Purpose: first-time contributor onboarding + label-driven response routing (`r:support`, `r:needs-repro`, etc.)
     - Additional behavior: applies contributor tiers on issues by merged PR count (`trusted` >=5, `experienced` >=10, `principal` >=20, `distinguished` >=50), matching PR tier thresholds exactly
     - Additional behavior: contributor-tier labels are treated as automation-managed (manual add/remove on PR/issue is auto-corrected)
@@ -59,7 +60,7 @@ Merge-blocking checks should stay small and deterministic. Optional checks are u
 - `Security Audit`: push to `main`, PRs to `main`, weekly schedule
 - `Workflow Sanity`: PR/push when `.github/workflows/**`, `.github/*.yml`, or `.github/*.yaml` change
 - `PR Labeler`: `pull_request_target` lifecycle events
-- `Auto Response`: issue opened/labeled, `pull_request_target` opened/labeled
+- `PR Auto Responder`: issue opened/labeled, `pull_request_target` opened/labeled
 - `Stale`: daily schedule, manual dispatch
 - `Dependabot`: weekly dependency maintenance windows
 - `PR Hygiene`: every 12 hours schedule, manual dispatch