fledge 0.15.3

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spec: plugin.spec.md
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## Context

The plugin system lets the community extend fledge without forking. It follows the git-style convention where `fledge deploy` resolves to a `fledge-deploy` binary. This keeps the core CLI lean while enabling ecosystem growth through installable extensions.

## Related Modules

- `config` — plugin directory paths under `~/.config/fledge/`
- `github` — GitHub API for search and clone operations

## Design Decisions

- Git-style binary resolution (`fledge-<name>` on PATH) — familiar to git users, works without installation
- Plugin manifest (`plugin.toml`) — explicit declaration of commands and hooks
- Symlinks into `plugins/bin/` — centralized lookup without modifying PATH
- GitHub topic convention (`fledge-plugin`) — same discovery pattern as templates