fledge 0.16.0

Dev-lifecycle CLI — scaffolding, tasks, lanes, plugins, and more.
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spec: spec.spec.md
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## User Stories

- As a developer, I want to run `fledge spec check` to validate my specs against source code
- As a developer, I want `fledge spec init` to set up spec-sync configuration in my project
- As a developer, I want `fledge spec new auth` to scaffold a complete spec module with companion files
- As a developer, I want `--strict` mode to treat warnings as errors in CI

## Acceptance Criteria

- `fledge spec check` validates all specs in the configured specs directory
- `fledge spec check --strict` treats warnings as errors
- `fledge spec init` creates `.specsync/` with config.toml, registry.toml, .gitignore, and version
- `fledge spec init` creates `specs/` directory if it doesn't exist
- `fledge spec new <name>` creates `specs/<name>/` with spec.md and companion files
- Validation checks: frontmatter fields, required sections, source file existence
- Exit code 1 on errors (or warnings in strict mode), 0 otherwise
- Colored output with checkmarks/crosses for each spec

## Constraints

- Must work without network access (no remote resolution)
- Config format must be compatible with spec-sync v4 config.toml
- Companion files use the same frontmatter format as spec-sync

## Out of Scope

- Bidirectional export validation (AST parsing of source code)
- AI-powered spec generation
- Schema/database validation
- Cross-project registry resolution
- Hash caching for incremental validation