docs(course): drop the phase tags and the workflow built on them

[vovinacci]

The phase tags were never pushed. origin carries only v1.1.0-v1.5.0, so git diff phase-2..phase-3 fails for everyone who clones this repo -- the course promised a history workflow no reader could run, in eleven places.

Pushing them was the alternative, and it is worse. Every tag predates the loopback port binding and the dashboard uid fix: all eight publish ports on every interface (8 mappings at phase-0, rising to 18 at rfc-0002) and none pins a dashboard uid. Publishing eight trees that put Postgres on the wire, to an audience that will check them out and run them, is not worth a diff convenience. Better to not ship the footgun than to document it.

The construction history is unaffected: every phase is a run of PRs on main, RFC-0001 Section 9 lists what each delivered, and the ADRs froze the decisions. The Tag column, the checkout instruction, the read-only-checkpoint paragraph, and the two "the rfc-000N tag will mark it" promises are gone.

Tags deleted locally, recreatable from these commits if ever wanted:

phase-0 8775267 Phase 0: repo restructure, CI, baseline hardening (#143)
phase-1 99d458a Phase 1: three-layer monitoring, canary v1 (#159)
phase-2 23170c3 Phase 2: contract-first gRPC + OpenTelemetry (#162)
phase-3 a8ccbc0 Phase 3: Go analytics, pipeline-lag canary v2 (#167)
phase-4 ec4810b Phase 4: load profile, Alertmanager, e2e gate (#172)
phase-5 9cb1b1f Phase 5: historical seeder, workshop mode (#175)
phase-6 393989a Phase 6: Kotlin reports, report load, canary v3 (#180)
rfc-0002 e4bbafc RFC-0002: reports-ui Caddy static SPA (#182)

All eight are ancestors of main, so the commits stay reachable regardless.

Summary by CodeRabbit

• Documentation
  • Updated course guidance to use the live main branch as the source of truth.
  • Simplified the course map by removing tag and checkpoint references.
  • Revised module descriptions to reflect current design status without tag references.
  • Updated platform history guidance to use commit history alongside RFCs and ADRs.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: 7d841b1f-9ed0-4a7c-83d1-085238b89446

📥 Commits

Reviewing files that changed from the base of the PR and between 4fd81cd and 3180604.

📒 Files selected for processing (1)

• docs/course.md

---

Walkthrough

The course documentation removes phase-tag browsing guidance, simplifies the course map, removes obsolete module tag references, and directs readers to main, RFC-0001, ADRs, and PRs for platform history.

Changes

Course documentation guidance

Layer / File(s)	Summary
Course reading and history guidance docs/course.md	Course usage and mapping instructions now use main as the source of truth, module status text no longer names phase tags, and platform history guidance uses git log --oneline with RFC-0001 sections and ADRs.

Estimated code review effort: 1 (Trivial) | ~5 minutes

Possibly related PRs

• vovinacci/devops-demo#184: Updates the same course guidance with a phase-tag workflow that this change subsequently removes.

Poem

I hopped through the docs with a cheerful thump,
Tags tucked away in a history lump.
Main now shines as the guiding light,
RFCs and ADRs make the path bright.
Binky, the course map’s clear tonight!

🚥 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 reflects removing phase tags and the tag-based workflow from the course docs.
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
• Commit unit tests in branch docs/drop-phase-tags

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[vovinacci]

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