Create the initial Fast Forward agents package structure

[coisa]

Objective

Create the initial fast-forward/agents package that will carry the packaged Fast Forward agent assets currently maintained under php-fast-forward/dev-tools.

Related parent work: php-fast-forward/dev-tools#195.

Current Limitation

The packaged .agents payload is still distributed from the dev-tools archive, which couples prompt and skill distribution to the main development-tools package. Consumer repositories need a stable installed path that Composer can manage directly.

Proposed Work

Introduce the initial repository structure for fast-forward/agents without changing dev-tools yet. The package should be prepared so a later dev-tools PR can require it and configure Composer installer paths instead of relying on linked or archived .agents content.

Scope

• Copy the current .agents tree from php-fast-forward/dev-tools into this repository as the package payload.
• Review the copied project agents and skills for assumptions that need to change now that the assets live in a standalone package.
• Add Composer metadata for the fast-forward/agents package, including the custom installer package type expected by [agents] Extract packaged agents into fast-forward/agents and install via composer installer-paths dev-tools#195.
• Add the standard Fast Forward repository files and automation needed for a package repository: README, changelog, license metadata, git attributes/ignore rules, CI workflows, and dev-tools configuration where applicable.
• Document the expected consumer installation path, including the Composer extra.installer-paths shape that installs the package into .agents/{$name}/.

Non-goals

• Do not change php-fast-forward/dev-tools in this issue.
• Do not update consumer repositories in this issue.
• Do not redesign the agent or skill content beyond minimal standalone-package compatibility fixes.
• Do not publish implementation changes directly to main; deliver the initial structure through a pull request.

Acceptance Criteria

Delivery Criteria

• The repository contains the copied .agents payload from php-fast-forward/dev-tools.
• composer.json declares fast-forward/agents with the agreed Composer package type for Fast Forward agent bundles.
• The package layout supports installation through Composer installer paths such as .agents/{$name}/ for packages of that custom type.
• README or docs explain the package purpose, expected installer path configuration, and relationship to [agents] Extract packaged agents into fast-forward/agents and install via composer installer-paths dev-tools#195.
• Copied agents and skills are reviewed for standalone-package path assumptions, with required compatibility changes included or explicitly documented.
• Standard repository automation and metadata are present and match Fast Forward package conventions where they apply to a prompt/agent asset package.
• Verification covers Composer metadata validity and any applicable repository quality checks.

Architectural / Isolation Criteria

• The implementation is isolated to php-fast-forward/agents.
• The branch contains only the initial package scaffold and copied agent payload work needed for this issue.
• Follow-up changes required in php-fast-forward/dev-tools remain tracked by [agents] Extract packaged agents into fast-forward/agents and install via composer installer-paths dev-tools#195 or a later dedicated issue.