Updated Ruby version from 3.4.3 to 3.4.6 to match CI environment
expectations. This fixes the bundle install failure in GitHub Actions.

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Co-Authored-By: Claude <[email protected]>

When installing shakapacker from a GitHub branch, the TypeScript source
needs to be compiled. Added a postinstall script that:
1. Detects if shakapacker was installed from source (has .ts but no .js files)
2. Installs shakapacker's dev dependencies
3. Runs the build script to compile TypeScript to JavaScript

This ensures the package is properly built even when installed directly
from GitHub instead of npm.

Also updated shakapacker reference to use explicit github: prefix for clarity.

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Co-Authored-By: Claude <[email protected]>

Updated Gemfile.lock and yarn.lock to pick up the latest changes from
the shakapacker justin808/early-hints branch.

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Co-Authored-By: Claude <[email protected]>

Add debug: true to early hints configuration to output debug info
as HTML comments in production, making it easier to verify that
early hints are working correctly.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <[email protected]>

Refreshed Gemfile.lock and yarn.lock to pull in the latest changes
from shakapacker's justin808/early-hints branch.

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Co-Authored-By: Claude <[email protected]>

Updated to commit 9a55db5d7c798154ecc2a95121ef3afa63f1e13e from
shakapacker's justin808/early-hints branch.

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Co-Authored-By: Claude <[email protected]>

Updated to commit 915edce51481bb1135853f9b877fd243623a9820 from
shakapacker's justin808/early-hints branch.

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Co-Authored-By: Claude <[email protected]>

Added --early-hints flag to all Procfile configurations to enable
Puma's early hints support. This allows Rails to send HTTP 103 Early
Hints responses with preload headers for better performance.

Updated files:
- Procfile (production)
- Procfile.dev
- Procfile.dev-prod-assets
- Procfile.dev-static
- Procfile.dev-static-assets

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Co-Authored-By: Claude <[email protected]>

Removed --early-hints flag from development-only Procfiles.
Kept it in:
- Procfile (production deployment)
- Procfile.dev-prod-assets (local testing with production assets)

Early hints are most useful in production and when testing with
production-compiled assets.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <[email protected]>

Added --early-hints flag to the Rails server command in the Control
Plane Dockerfile. This enables Puma to send HTTP 103 Early Hints
responses in production, allowing browsers to preload assets while
the server is still preparing the HTML response.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <[email protected]>