release: compile v4.5.1 changelog

[sumitake]

Summary

Compile the pending v4.5.1 changelog fragments after the repaired activation bundle merged. This generated-only release step records the OpenCode Go route, provider-agnostic structural containment and canonical-HOME behavior, notarized runtime activation artifact, expanded skills/docs, and lifecycle reliability repairs already merged on main.

Scope and verification

• Only generated CHANGELOG.md changes.
• python3 scripts/build_skills.py --check
• python3 scripts/build_marketplace.py --check
• python3 scripts/build-changelog.py --check
• python3 -m unittest discover -s tests -t . -v — 579/579
• python3 -m unittest discover -s scripts -p test_*.py -v — 254/254
• python3 scripts/check_release_consistency.py
• python3 scripts/verify_runtime_release.py
• canonical activation archive verification
• secret scan and active-tree public export safety
• git diff --check

Review and post-condition

The substantive exact-head v4.5.1 runtime commit 7e86d44f8c8a607de439f4eef2fde0dafa191975 received a Google Gemini 3.1 Pro High PROCEED at confidence H with no findings or novel risk, recorded at PR #65 comment 5084598017. This branch is the deterministic changelog compilation over merged runtime anchor 3b10d380f0076a6818035b21296679e7abaa2376.

After merge: cut and verify the signed annotated v4.5.1 tag and published assets, then use the continuity-safe private lifecycle to replace only the inactive candidate while preserving lane 30, install the repaired watcher, and require serial installed Gemini/Grok/OpenCode successes.

author: codex (OpenAI GPT-5.6-sol, xhigh)
standing_directives: AGENTS.md source boundary, public release governance, fragment compilation, signed tag, artifact verification, continuity-safe activation
tier: 3
cross_check: PROCEED - Google Gemini 3.1 Pro High reviewed the exact substantive v4.5.1 runtime head with confidence H, novel risk none, zero findings; current diff is deterministic generated changelog only
post_condition: signed-tag v4.5.1, verify published artifact and evidence, preserve lane 30 while replacing inactive candidate, install repaired watcher, serial installed Gemini Grok OpenCode successes
mcp_coverage_gap: NONE
contributor_rights: OWNER-AUTHORED
operator_reserved: no

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Expose the v4.5.1 release heading

Because this HTML comment is invisible in rendered Markdown, the following Changed, Tests, and Fixed sections have no visible v4.5.1 parent heading, so users viewing the release changelog cannot identify which entries belong to the current release. Replace the marker in the source fragment with a rendered ### agent-collab 4.5.1 — 2026-07-26 heading and regenerate this file.

AGENTS.md reference: AGENTS.md:L32-L33

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