Midas v0.1.1 — recall noise floor + end-to-end quickstart

Patch release addressing external testing of 0.1.0.

• Fixed: recall no longer returns a lone irrelevant memory with the offline hashing fallback — the embedder declares an absolute noise floor (cosine ≈0 = no token overlap), so a query that matches nothing returns empty instead of junk. Real matches are unaffected, and the benchmarked semantic path is unchanged.
• quickstart.py is now a real end-to-end demo (remember → assemble → recall → supersession → guard), run by a CI test so it can't silently break.
• midas doctor clearly flags when the SDK is installed but the [mcp] server extra is not.

uv tool install "midas-memory[mcp,local]" · full notes in CHANGELOG.md.