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-sodium/CHANGELOG.md

@@ -0,0 +1,21 @@
+# @suaveplan/crypto-sodium — Changelog
+
+## 0.0.0 (suaveplan)
+
+Initial implementation on the suaveplan branch.
+
+### Added
+
+- `sodiumReady(): Promise<void>` — lazy WASM initialisation singleton.
+- `sodiumAeadEngine` — XChaCha20-Poly1305 / ChaCha20-Poly1305 / AES-256-GCM AEAD engine.
+- `sodiumAesGcmEngine` — AES-256-GCM–preferring AEAD engine (falls back to ChaCha20).
+- `createSodiumAeadEngine(opts)` — factory for custom AEAD engine configurations.
+- `sodiumSignEngine` — Ed25519 sign/verify/generateKeypair engine.
+- `sodiumAgreeEngine` — X25519 Diffie-Hellman agree/generateKeypair engine.
+- `sodiumSealedBoxEngine` — anonymous-sender sealed box (`crypto_box_seal`).
+- `sodiumAuthBoxEngine` — authenticated box (`crypto_box_easy`).
+- `cryptoKdf` — BLAKE2b-based deterministic subkey derivation.
+- `cryptoAuth` / `cryptoAuthVerify` — BLAKE2b MAC.
+- `cryptoPwhashStr` / `cryptoPwhashStrVerify` — Argon2id password hashing.
+- `ristretto255` namespace — group operations (add, sub, mul, fromHash, toBytes, fromBytes, random).
+- `SodiumError` + `SODIUM_CODES` — structured error surface.