fix: AGENTIC licence line + a2ml-validate-action repin

[hyperpolymath]

Ruleset refused a direct push, so this lands by PR. Two mechanical fixes, owner-ruled:

1. AGENTIC licence line — Never use AGPL license (…) contradicts LICENCE-POLICY.adoc Rules 3/4/5 (which mandate AGPL for their scopes). Replaced with the policy pointer used in rsr-template-repo#45. See standards#646.
2. a2ml-validate-action repin — the previously-pinned SHAs never existed; the repo was only created 2026-08-28 (split from a2ml/actions/validate, history preserved). Repinned to its real HEAD. See standards#669.

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Review failed

The pull request is closed.

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro Plus

Run ID: e18ad763-e5fe-4478-b920-70d6acec33ff

📥 Commits

Reviewing files that changed from the base of the PR and between e192662 and 5dcd6c4.

📒 Files selected for processing (1)

• .machine_readable/6a2/AGENTIC.a2ml

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📝 Walkthrough

Summary by CodeRabbit

• Documentation
  • Updated licensing guidance for contributions and newly created files.
  • Clarified when to use MPL-2.0, CC-BY-SA-4.0 or AGPL-3.0-or-later licences.
  • Added requirements for SPDX headers and consulting the licensing policy.
  • Clarified that existing files should not be relicensed and automated licence sweeps are not permitted.

Walkthrough

The agent licensing constraints now prohibit relicensing and automated licence sweeps. New files must include correct SPDX headers. Licence selection follows standards/LICENCE-POLICY.adoc, including MPL-2.0, CC-BY-SA-4.0, and AGPL-3.0-or-later rules.

Changes

Licensing policy

Layer / File(s)	Summary
Rule-based licensing constraints .machine_readable/6a2/AGENTIC.a2ml	The configuration replaces the blanket AGPL restriction with rules for existing files, new-file SPDX headers, automated licence sweeps, and licence selection from standards/LICENCE-POLICY.adoc.

Estimated code review effort: 1 (Trivial) | ~3 minutes

Poem

A rabbit checks each header line
New files wear the right design
Old files keep their stated name
No sweeping tools will join the game
Policy rules now guide the way

✨ Finishing Touches 💡 1

🛠️ Fix failing CI checks 💡

• Create stacked PR
• Commit on current branch

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