Add NOTICE backbone and provider rollout guide; update README and CODEBASE_MAP

[weroperking]

Motivation

• Introduce a single repository entry point and formalize provider capability guidance so contributors and consumers can quickly find orientation and rollout rules.

Description

• Add NOTICE.md as the repository backbone/index with top-level navigation and provider limitation rules.
• Add provider rollout and capability guide at docs/guides/provider-capabilities-and-rollout.md documenting capability matrices, implementation blueprint, and API/UI parity checklist.
• Update README.md, CODEBASE_MAP.md, and docs/README.md to reference the new NOTICE.md and provider rollout guide and bump the documented "Last updated" dates.
• Add a "Canonical Orientation Files" section to CODEBASE_MAP.md and wire the new guide into documentation indexes.

Testing

• No automated tests were run for these documentation-only changes.

---

Codex Task

Summary by CodeRabbit

Release Notes

• Documentation
  • Added structured project orientation with canonical entry-point documentation for clearer navigation.
  • Introduced comprehensive provider capabilities and rollout guide detailing platform support levels and implementation planning.
  • Enhanced documentation structure and navigation hierarchy.

[coderabbitai]

Caution

Review failed

Pull request was closed or merged during review

Walkthrough

Documentation-only update establishing canonical repository orientation files and provider capabilities guidance. Adds NOTICE.md as a backbone index defining provider limitations and rollout sequencing; updates metadata in CODEBASE_MAP.md and README.md; creates provider-capabilities-and-rollout.md with capability matrix and implementation blueprint.

Changes

Cohort / File(s)	Summary
Orientation Metadata CODEBASE_MAP.md, README.md	Updated timestamps (2026-03-29 → 2026-03-30); added "Canonical Orientation Files" section defining official entry-points and "Project Backbone" section with provider rollout status links.
New Backbone Index NOTICE.md	New orientation document establishing repository entry-point order, top-level area links, multi-tenant provider limitations snapshot with RLS/guardrails expectations, API/Dashboard parity rules, and queue/background workflow limitations for Inngest.
Documentation Navigation & Guides docs/README.md, docs/guides/provider-capabilities-and-rollout.md	Updated docs navigation to reference new provider capabilities guide; added comprehensive provider-by-provider capability matrix (Postgres, Neon, Supabase, Turso, PlanetScale), phased implementation blueprint (centralized registry, tenant guardrail engine, API-first configurability), and provider-specific integration guidance.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Possibly related PRs

• Coderabbit/full review #46: Updates orientation metadata in CODEBASE_MAP.md and README.md with same timestamp/structural intent.
• Documentation enhancement  #38: Modifies docs/README.md navigation structure and guides section organization.
• docs: update codebase map with detailed documentation and add cli-aut… #32: Restructures CODEBASE_MAP.md content and canonical file definitions.

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	Title directly describes the main changes: adding NOTICE.md as a backbone document, adding a provider rollout guide, and updating three documentation files.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch codex/discuss-multi-tenant-database-connections

---

Thanks for using CodeRabbit! It's free for OSS, and your support helps us grow. If you like it, consider giving us a shout-out.

❤️ Share

• X
• Mastodon
• Reddit
• LinkedIn

_{Comment @coderabbitai help to get the list of available commands and usage tips.}