docs: update all pointers after keyderive + QE restructure

CLAUDE.md: add QE/ to structure, key modules table, server state reference,
security rule updated (QE/ not keypair files), meshbay.org inventory pointer.

devel-phases.md: add milestones 6.6-6.9 (keyderive, bundle, demo scripts,
QUICKSTART rewrite). 81/81 tests.

docs/meshbay-draft-v3.md §6.1.1: new section documenting 3 key generation
strategies (Argon2id CLI, WebCrypto browser+bundle, keystore file) and the
algorithm mismatch caveat between CLI and web registration paths.

docs/USERGUIDE.md §2 Register+Login: replace "generate and persist before
registering" warning with the two clean strategies (derive_keys_from_password
for CLI, keyderive.js + keypair_bundle for browser). Login response updated
with keypair_bundle field.

hub/models.py + users.py + Alembic migration: keypair_bundle column on User,
stored at registration, returned at login (web clients only).

Co-Authored-By: Claude Sonnet 4.6 (1M context) <noreply@anthropic.com>

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