[P2] Docs: fix install instructions & honest feature status

Tasks

README install: document fresh-venv + pip install -e ".[dev]" (post-Feat/the mvp #1).
Mark self-healing as in-progress until update README.md #2 lands; don't overstate.
Align README/proposal storage claims with Feature/healing loop #4 outcome.
Note real language support status (Python stable; Java/JS beta until [P0] Implement bounded verify→repair self-healing loop #9).

Docs match shipped behavior.

Done on master. The README and docs/ were rewritten in #20 and #21 and cross-checked against the code:

Install. README "Installation" and "Development" sections (pip install -e ".[dev]"); docs/quickstart.md.
Self-healing. Now implemented ([P0] Implement bounded verify→repair self-healing loop #9) and documented as it actually works: up to two repair rounds, then diagnosis.
Storage. SQLite, as in docs/architecture.md (see [P1] Intent vector store + similarity (ChromaDB) or amend proposal #11).
Language support. v1 is Python only. Other languages get no tests, and the CLI and README say so. docs/task.md lists what is done, what exists but is unused (Java/JS adapters) and what is planned.

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