feat(core): add provider-adapter-author skill

Converts a target repo's provider-specific instruction file (CLAUDE.md,
.cursor/rules, copilot-instructions.md, etc.) into a thin adapter over
AGENTS.md, mirroring this repo's own two-tier CLAUDE.md pattern
(ADR-0002/0003). Self-validates via a bundled deterministic script
(scripts/validate-adapter.sh) rather than a separate paired audit skill.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
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# provider-adapter-author
Convert a target repo's provider-specific instruction file (CLAUDE.md, .cursor/rules, copilot-instructions.md, etc.) into a thin adapter over AGENTS.md.
## What it does
Detects a provider-specific AI instruction file in a target repo, diffs it against the repo's `AGENTS.md`, and rewrites it down to a minimal reference — an `@AGENTS.md`-style import for providers that support one, or a text pointer for those that don't — plus only genuinely provider-specific additions. Self-validates its own output with a bundled deterministic script (no LLM judgment, no separate audit skill) before finishing.
## Before you start
The target repo must already have an `AGENTS.md`. If it doesn't, run `agentsmd-author` first — this skill never creates or edits `AGENTS.md` itself.
## Usage
```
/provider-adapter-author
```
Provide the path to the provider-specific file to convert (and the target repo root, if not inferable). Can be invoked directly, or composed into by `agentsmd-author` when it detects an existing provider file with content overlapping AGENTS.md.
## Files
| File | Purpose |
|------|---------|
| `SKILL.md` | Skill instructions for agents |
| `references/sources.md` | Provenance record — the in-repo ADR precedent this skill's design is modeled on |
| `scripts/validate-adapter.sh` | Self-check gate: reference to AGENTS.md present, no excessive duplication, adapter stays thin |
| `scripts/README.md` | Directory documentation for `scripts/` |
| `tests/README.md` | Bats test dependency and run instructions |
| `tests/validate-adapter.bats` | Bats test suite for `scripts/validate-adapter.sh` |