docs(auto-derive): document cross-repo dispatch trigger + fix dead G6 link

[bradymiller]

Summary

Two README updates following the G6 work that landed:

1. Fix dead `G6 matrix` link. Original rabbit comment from PR feat(auto-derive): scaffold ip_map + demoLibrary derivation bot (dry-run) #135 review (id=3485751948) flagged this; the addressed-in-commit fix targeted README:6 but missed this second occurrence at README:19. Replaced with prose since the matrix lives in the design doc linked above, not anywhere in this repo.

2. Document the cross-repo dispatch trigger. PR feat(auto-derive): atomic flip — retire bump-tag.yml + tools/release/ PHP toolchain #141 added the `repository_dispatch: types: [release-targets-changed]` listener; feat(release): add release-targets-changed dispatch event + workflow openemr#12657 added the openemr-side dispatcher that fires it on push to `.github/release-targets.yml`. README's "Daily reconcile + auto-PR" section is rewritten as "Triggers + reconcile + auto-PR" — enumerates all 3 fire triggers (daily cron, release-targets-changed dispatch, manual workflow_dispatch) with the existing reconciliation behavior under a unified "in all three trigger paths" framing.

Test plan

• CI passes (workflow lint)
• README renders correctly on GitHub

🤖 Generated with Claude Code

Summary by CodeRabbit

• Documentation
  • Updated section ownership guidance to link to the external design reference.
  • Reorganized reconcile documentation into a single “Triggers + reconcile + auto-PR” section covering scheduled, event-based, and manual entrypoints.
  • Clarified trigger behavior, including how dry-run differs and what it uploads, plus the reconcile flow for diff detection and no-diff outcomes.
  • Reiterated the limitation that bot-created pull requests won’t automatically trigger downstream workflows, and noted how to re-run CI manually.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

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Reviewing files that changed from the base of the PR and between 8e1f83f and e5845e9.

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• tools/auto-derive/README.md

✅ Files skipped from review due to trivial changes (1)

• tools/auto-derive/README.md

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📝 Walkthrough

Walkthrough

Updates tools/auto-derive/README.md to point the section ownership reference at the G6 design doc, replace the daily reconcile section with three trigger paths, and keep the GITHUB_TOKEN caveat plus manual CI re-trigger command.

Changes

README documentation update

Layer / File(s)	Summary
Section ownership and reconcile docs tools/auto-derive/README.md	Updates the G6 reference link, lists the daily cron, repository_dispatch, and workflow_dispatch reconcile entrypoints, describes reconcile versus dry-run behavior, and preserves the bot PR caveat and empty-commit CI instruction.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Possibly related PRs

• openemr/demo_farm_openemr#138: Adds the reconcile workflow behavior that this README update documents, including trigger paths and PR update handling.

Poem

🐇 I nibbled the README, neat and bright,
Three triggers now hop in clear daylight.
A G6 doc glows where anchors once slept,
And CI gets a nudge when an empty commit’s kept.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately summarizes the README docs update: the new cross-repo dispatch trigger and the dead G6 link fix.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[coderabbitai]

Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@tools/auto-derive/README.md`:
- Around line 145-149: The README wording for the workflow trigger section
conflates dry-run with the reconcile path, since `workflow_dispatch` can select
`dry-run` and that mode does not create or update a PR. Update the section
around the `workflow_dispatch` description and the “reconcile job” wording to
explicitly scope the behavior to reconcile mode, or split out a separate dry-run
description so the `reconcile` and `dry-run` paths are clearly distinguished.

🪄 Autofix (Beta)

Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: a257de96-f5f5-459a-b81a-fe7a3eb49607

📥 Commits

Reviewing files that changed from the base of the PR and between bce5c3b and 8e1f83f.

📒 Files selected for processing (1)

• tools/auto-derive/README.md