docs: add ack package README for pub.dev

[leoafarias]

Summary

pub.dev now rejects packages with empty README files. The ack core package had an empty README which caused the beta.10 publish to fail (4/5 packages published, ack was rejected).

Adds a proper README based on the root README content.

Context

Part of the v1.0.0-beta.10 release — need to merge this, re-tag, and re-publish ack.

[docs-page]

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docs.page/btwld/ack~98

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[Copilot]

Pull request overview

Adds missing package-level documentation for the core ack package to satisfy pub.dev publish requirements, alongside beta.10 release version/changelog alignment across the workspace packages.

Changes:

• Add a non-empty packages/ack/README.md suitable for pub.dev.
• Bump package versions to 1.0.0-beta.10 and update intra-workspace dependency constraints.
• Add 1.0.0-beta.10 entries to package changelogs linking to release notes.

Reviewed changes

Copilot reviewed 11 out of 11 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
packages/ack/README.md	Adds pub.dev-facing README content for the core ack package.
packages/ack/pubspec.yaml	Bumps ack version to 1.0.0-beta.10.
packages/ack/CHANGELOG.md	Adds 1.0.0-beta.10 changelog entry linking to release notes.
packages/ack_annotations/pubspec.yaml	Bumps ack_annotations version to 1.0.0-beta.10.
packages/ack_annotations/CHANGELOG.md	Adds 1.0.0-beta.10 changelog entry linking to release notes.
packages/ack_generator/pubspec.yaml	Bumps ack_generator version and updates ack/ack_annotations dependency constraints to beta.10.
packages/ack_generator/CHANGELOG.md	Adds 1.0.0-beta.10 changelog entry linking to release notes.
packages/ack_firebase_ai/pubspec.yaml	Bumps ack_firebase_ai version and updates ack dependency constraint to beta.10.
packages/ack_firebase_ai/CHANGELOG.md	Adds 1.0.0-beta.10 changelog entry linking to release notes.
packages/ack_json_schema_builder/pubspec.yaml	Bumps ack_json_schema_builder version and updates ack dependency constraint to beta.10.
packages/ack_json_schema_builder/CHANGELOG.md	Adds 1.0.0-beta.10 changelog entry linking to release notes.

[Copilot]

The PR title/summary focuses on adding a non-empty README for ack, but this PR also bumps versions and updates changelogs across multiple packages (including dependency constraints). If that’s intended for the beta.10 release, please update the PR title/description to reflect the broader release/versioning scope (or split version/changelog bumps into a separate PR).