feat(v3.12.0): media pipeline, AI image generation, capability probe, companion v2.9.0

Three-month batch sync from internal repo (~80 commits) covering Tracks F.5a, F.7e, F.8, F.17, F.18, F.X.

WordPress media pipeline
- Pillow-based optimization, AI image generation (OpenAI / Stability / Replicate / Google Nano Banana / OpenRouter), chunked + resumable uploads, bulk delete/reassign, idempotent retries.

Capability discovery (F.7e)
- Per-site credential probe + adapters for WordPress / WooCommerce / Gitea, tier-fit unions granted ∪ roles, capability badge UI with HTMX partial re-check, install hint in every companion-unreachable error.

Companion plugin overhaul
- Renamed wordpress-plugin/airano-mcp-seo-bridge → wordpress-plugin/airano-mcp-bridge.
- Eight new endpoints: /capabilities, /bulk-meta, /export, /cache-purge, /transient-flush, /site-health, /audit-hook, /upload-and-attach.
- wp.org Plugin Check pass: i18n, WP_Filesystem, scheme allowlist on audit-hook URL.

Other
- Gitea ergonomics (F.17): batch files, tree, search, compare, releases, fork.
- Opportunistic bcrypt upgrade for legacy SHA-256 admin keys (F.8).
- n8n refactor: structured errors, capability probe, missing tools backfilled.
- Idempotency-Key dedup for AI media upload retries; WP client fast-fails on unreachable sites.

Docs
- README + CLAUDE.md drop the fixed "633 tools" claim. The total grows with each release; per-plugin approximations + dashboard-surfaced counts replace it.
- Tools/Tests badges removed in favour of "Plugins: 10".

Deployment
- PyPI mirror chain, optional BUILD_HTTP_PROXY, Alpine→Yandex apk mirror, Debian-slim Plan-B Dockerfile, mirror.gcr.io variant.

CI
- Black + Ruff clean on Python 3.12; pytest tests/ green.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

plugins/ai_image/__init__.py

@@ -0,0 +1,33 @@
+"""AI image generation provider library (F.5a.4).
+
+Not a registered MCP plugin — this package exposes provider
+implementations and a lookup registry consumed by media-upload tools in
+other plugins (currently ``wordpress_generate_and_upload_image``).
+
+Typical usage::
+
+    from plugins.ai_image.registry import get_provider
+
+    provider = get_provider("openai")
+    result = await provider.generate(
+        api_key=key, prompt="a red cube", size="1024x1024"
+    )
+    image_bytes, mime, meta = result.bytes, result.mime, result.meta
+"""
+
+from plugins.ai_image.providers.base import (
+    BaseImageProvider,
+    GenerationRequest,
+    GenerationResult,
+    ProviderError,
+)
+from plugins.ai_image.registry import get_provider, list_providers
+
+__all__ = [
+    "BaseImageProvider",
+    "GenerationRequest",
+    "GenerationResult",
+    "ProviderError",
+    "get_provider",
+    "list_providers",
+]