docs: document release pathway + guard unpublished channels in AGENTS.md

[aallan]

What

Adds a Releases and install docs section to AGENTS.md and an unpublished-channel guard to CLAUDE.md's release-workflow section.

Why

An agent twice documented a distribution channel as an available install route before the artifact was live there — first pip install veralang before it was on PyPI, then the VS Code Marketplace install route before the extension was accepted (backed out in #1107). The root cause is structural: AGENTS.md had no release-pathway or install-docs guidance at all, so the correction never stuck.

Changes

• AGENTS.md — new Releases and install docs section:
  • Releases are automated after merge (release.yml → approval-gated pypi environment → Trusted Publishing → tag + GitHub Release at the merge SHA); don't create tags, run twine, or gh release create.
  • Install docs are circumstance-dependent — match README.md / SKILL.md / PYPI_README.md (source checkout = full environment and the recommended route for agents; pip install veralang = toolchain only; never pip install vera), and never document a channel as available before it's live (the VS Code extension is still blocked — VS Code Marketplace rejects extension as suspicious content #1106).
• CLAUDE.md — the same unpublished-channel guard added to ## Release workflow (its mechanics were already correct).
• docs/llms-full.txt — regenerated by scripts/build_site.py.

Docs-only; no version bump. check_doc_counts, check_site_assets, and check_changelog_updated all pass locally.

🤖 Generated with Claude Code

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Review details

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: ASSERTIVE

Plan: Pro Plus

Run ID: c21e3fdd-22ab-40e9-a176-5689004dbc16

📥 Commits

Reviewing files that changed from the base of the PR and between 7e9d04f and f552689.

⛔ Files ignored due to path filters (1)

• docs/llms-full.txt is excluded by !docs/**

📒 Files selected for processing (2)

• AGENTS.md
• CLAUDE.md

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch docs/agents-release-install-guardrails

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.72%. Comparing base (7e9d04f) to head (f552689).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1108   +/-   ##
=======================================
  Coverage   93.72%   93.72%           
=======================================
  Files          96       96           
  Lines       32708    32708           
  Branches      456      456           
=======================================
  Hits        30654    30654           
  Misses       2041     2041           
  Partials       13       13           

Flag	Coverage Δ
javascript	78.41% <ø> (ø)
python	95.48% <ø> (ø)

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[aallan]

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