Move docs/ package mirror into document-navigator plugin

Relocate the ~6k-file docs tree from the repo root into
plugins/document-navigator/docs/ so the plugin is self-contained and
portable. docs/superpowers/ (specs and plans) stays at the repo root.

Moved via cp+rm rather than git mv because directory rename() fails with
EPERM on this WSL /mnt DrvFs mount; git rename-detection pairs the
identical-content files at commit time.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

plugins/document-navigator/docs/security-stack/crypto/crypto-browser/CHANGELOG.md

@@ -0,0 +1,16 @@
+# @suaveplan/crypto-browser Changelog
+
+## 0.0.0 — suaveplan initial
+
+- Initial implementation: WebCrypto-backed AEAD, sign, and agree engines
+- `webCryptoAeadEngine` — AES-256-GCM via `crypto.subtle`
+- `webCryptoSignEngine` / `webCryptoEd25519Engine` / `webCryptoEcdsaP256Engine` — Ed25519 and ECDSA-P256
+- `webCryptoAgreeEngine` / `webCryptoX25519Engine` / `webCryptoEcdhP256Engine` — X25519 and ECDH-P256
+- `rsa` namespace — RSA-PSS, RSA-OAEP, RSASSA-PKCS1-v1_5
+- `aesKw` namespace — AES Key Wrap (RFC 3394)
+- `ecdsaP384` namespace — ECDSA with P-384 / SHA-384
+- `ecdhP384` namespace — ECDH with P-384
+- `nonExtractableKey()` — non-extractable CryptoKey generation
+- `isWebCryptoAvailable()` / `assertWebCryptoAvailable()` — runtime checks
+- `BrowserCryptoError` with codes: `NOT_AVAILABLE`, `KEY.GENERATION_FAILED`, `OPERATION.FAILED`
+- 100% coverage threshold (statements, branches, functions, lines)