docs: merge SKALD.md into CLAUDE.md and remove it

CLAUDE.md and SKALD.md had drifted apart. CLAUDE.md still described a
hand-maintained connectors.json (pre-compile.py), an rsync deploy, 5
connectors, and a files[] that excluded connector.json.

CLAUDE.md is now the single working document, carrying every SKALD.md
section — full schemas for connectors.json / fragment.json /
connector.json, reserved enums, the auth/deliver/env/verify fields,
placeholder syntax, friendly tool names, icon conventions, file
integrity, local workflow and deploy — corrected against the actual
repo state: 18 connectors, the scripts/compile.py pipeline, and
connector.json included in the hashed files[].

It also names CONNECTOR_MANIFEST_GUIDE.md (repo root) as the
authoritative connector-authoring spec.

CHANGELOG.md

@@ -7,6 +7,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+### Changed
+
+- **Docs: `SKALD.md` merged into `CLAUDE.md` and removed.** The two files had drifted apart — `CLAUDE.md` still described a hand-maintained `connectors.json` (pre-`compile.py`), an rsync deploy, 5 connectors, and a `files[]` that excluded `connector.json`. `CLAUDE.md` is now the single authoritative spec, carrying every `SKALD.md` section (full schemas for `connectors.json` / `fragment.json` / `connector.json`, reserved enums, `auth`/`deliver`/`env`/`verify` fields, placeholder syntax, icon conventions, file integrity, local workflow, deploy) corrected against the actual repo state: 18 connectors, the `compile.py` pipeline, and `connector.json` included in the hashed `files[]`. `CLAUDE.md` now also names `CONNECTOR_MANIFEST_GUIDE.md` (repo root) as the authoritative connector-authoring spec.
+
 ## 2026-08-24
 
 ### Fixed