chore: tighten AI workflow skills and align project docs

[michalurbanek]

Chores

• Backfill allowed-tools: and model: on all 18 skills so SKILL.md frontmatter is uniform, and update AGENTS.md "Creating a new skill" to require these fields for new skills.
• Refresh .claude/CLAUDE.md slash-command listing and align README ToC labels with their section headers.
• Fix project-setup skill to reference the right README item number for the Firebase step, and normalize the create-pr screenshot placeholder.

Refactor

• Drop the default repository layer from tasks / techspec skills and templates; data flow now goes through use cases and providers, with repositories only when already present or explicitly justified.

[Copilot]

Pull request overview

This PR standardizes the repo’s AI workflow documentation and templates, ensuring skill frontmatter is uniform and the architecture guidance consistently routes data flow through Riverpod use cases/providers (with repositories only when already present or explicitly justified).

Changes:

• Normalize skill metadata by backfilling allowed-tools: and model: in skill frontmatter and documenting these as required in AGENTS.md.
• Update techspec/tasks templates and skill guidance to de-emphasize a default repository layer in favor of use cases/providers.
• Align docs and references: README ToC labels, .claude/CLAUDE.md command list, project-setup checklist item references, and create-pr screenshot placeholder.

Reviewed changes

Copilot reviewed 17 out of 17 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
README.md	Align ToC entry labels with section headers.
ai/templates/techspec.md	Update architecture/template guidance and examples to use use cases/providers by default.
ai/templates/task.md	Adjust task template prompts to reference use cases/providers vs repositories.
ai/templates/task-list.md	Update Phase 1 wording to “use cases/providers” instead of repository-first phrasing.
ai/skills/upgrade/SKILL.md	Add/standardize allowed-tools + model frontmatter.
ai/skills/techspec/SKILL.md	Update guidance to prefer use cases/providers and limit repository abstraction to justified cases.
ai/skills/tasks/SKILL.md	Update data-layer phase guidance to Riverpod use cases/providers.
ai/skills/secrets-bootstrap/SKILL.md	Add/standardize allowed-tools + model frontmatter.
ai/skills/release-prepare/SKILL.md	Add/standardize allowed-tools + model frontmatter.
ai/skills/release-builds/SKILL.md	Add/standardize allowed-tools + model frontmatter.
ai/skills/project-setup/SKILL.md	Add/standardize frontmatter; fix README checklist item references for platform cleanup/Firebase.
ai/skills/pr-review/SKILL.md	Add/standardize allowed-tools + model frontmatter.
ai/skills/feature-screen/SKILL.md	Add/standardize allowed-tools + model frontmatter.
ai/skills/feature-data-flow/SKILL.md	Add/standardize allowed-tools + model frontmatter.
ai/skills/create-pr/SKILL.md	Normalize screenshot placeholder text in PR body template.
AGENTS.md	Require allowed-tools and model (and document user-invocable) for new skills.
.claude/CLAUDE.md	Refresh slash-command listing to reflect current commands/skills.

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