feat(typegen): add supabase_typegen skeleton package

[spydon]

What kind of change does this PR introduce?

Feature. Adds an empty skeleton for a new supabase_typegen package so we can publish it to pub.dev and reserve the name.

The full generator implementation lands separately in #1635; this PR intentionally contains only the minimal publishable placeholder.

What is the new behavior?

A new packages/supabase_typegen package containing:

• a publishable pubspec.yaml (version 0.1.0, no publish_to: none) so the melos release pipeline picks it up,
• a placeholder library, README, CHANGELOG and LICENSE,
• supabase_lints wired in via analysis_options.yaml (analyzes clean).

It is wired into:

• the root workspace in pubspec.yaml,
• the Dart CI test matrix in test.yml,
• the pana release matrix in release-pana.yml,
• the SDK compliance parse ignore (.sdk-parse-ignore), since it is a development-time tool rather than SDK client surface.

Additional context

The README and CHANGELOG flag 0.1.0 as a name-reserving placeholder; the generator implementation will replace it in a later release.

Summary by CodeRabbit

• New Features
  • Added a new supabase_typegen package placeholder (v0.1.0) to generate typed Dart table definitions from Supabase schemas.
• Documentation
  • Added initial README and changelog entries documenting current placeholder status and reserved pub.dev name.
• CI / Chores
  • Updated release and test workflows to run checks for supabase_typegen when relevant, including coverage carryforward.
  • Excluded supabase_typegen from SDK public API scanning (development-time generator).
• Legal
  • Added the MIT license for the new package.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro Plus

Run ID: 80e70d53-a934-4adb-8aed-bea022361ae5

📥 Commits

Reviewing files that changed from the base of the PR and between d20e356 and d2555a4.

📒 Files selected for processing (2)

• .github/workflows/test.yml
• packages/supabase_typegen/test/supabase_typegen_test.dart

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📝 Walkthrough

Walkthrough

Adds the placeholder supabase_typegen Dart package, including metadata, documentation, licensing, a library declaration, and a placeholder test. Registers it in the workspace and updates testing, coverage, release Pana, and SDK API scan configuration.

Changes

supabase_typegen package

Layer / File(s)	Summary
Package scaffolding packages/supabase_typegen/pubspec.yaml, packages/supabase_typegen/lib/..., packages/supabase_typegen/analysis_options.yaml, packages/supabase_typegen/README.md, packages/supabase_typegen/CHANGELOG.md, packages/supabase_typegen/LICENSE, packages/supabase_typegen/test/...	Defines package metadata, Dart SDK constraints, development dependencies, lint configuration, placeholder library, documentation, changelog, MIT license, and a placeholder test.
Workspace and CI integration pubspec.yaml, .sdk-parse-ignore, .github/workflows/test.yml, .github/workflows/release-pana.yml	Registers supabase_typegen in the workspace, excludes it from SDK API scanning, and includes it in Dart testing, Coveralls carryforward, and release Pana matrices.

Estimated code review effort: 2 (Simple) | ~10 minutes

🚥 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 clearly matches the main change: adding a new supabase_typegen skeleton package.
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 feat/supabase-typegen-skeleton

Warning

There were issues while running some tools. Please review the errors and either fix the tool's configuration or disable the tool if it's a critical failure.

🔧 Checkov (3.3.8)

.github/workflows/test.yml

Traceback (most recent call last):
File "/usr/local/bin/checkov", line 2, in
from checkov.main import Checkov
ModuleNotFoundError: No module named 'checkov'

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[coderabbitai]

Actionable comments posted: 2

🤖 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 @.github/workflows/test.yml:
- Line 67: Update the coverage-finished carryforward package list in the
workflow to include supabase_typegen, matching the existing DART_PACKAGES entry,
so skipped dynamic-matrix runs preserve its coverage.
- Line 67: The Dart workflow’s shared formatting step includes supabase_typegen
even though it lacks a test directory. Update the workflow’s stable-format logic
to pass only existing paths, or add a minimal test directory for
supabase_typegen; ensure formatting no longer fails on the missing test path
while preserving formatting for all existing package sources.

🪄 Autofix (Beta)

Fix all unresolved CodeRabbit comments on this PR:

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

---

ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro Plus

Run ID: b1f30a73-de8a-4d4c-8911-a919e69056f9

📥 Commits

Reviewing files that changed from the base of the PR and between f65c7ae and e5da56a.

📒 Files selected for processing (10)

• .github/workflows/release-pana.yml
• .github/workflows/test.yml
• .sdk-parse-ignore
• packages/supabase_typegen/CHANGELOG.md
• packages/supabase_typegen/LICENSE
• packages/supabase_typegen/README.md
• packages/supabase_typegen/analysis_options.yaml
• packages/supabase_typegen/lib/supabase_typegen.dart
• packages/supabase_typegen/pubspec.yaml
• pubspec.yaml