chore(release): cut the 0.9.0 changelog section

CHANGELOG.md

@@ -6,12 +6,15 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
 
 ## [Unreleased]
 
+## [0.9.0] - 2026-06-23
+
 ### Added
 
 - **Architectural Conventions Standard — a per-project, repo-canonical architecture map that gates where code may live.** Beyond the `make`-style checks (syntax, types, tests), each project can carry a `.roboco/conventions.yml` declaring which definition *kinds* belong in which modules, a toggleable rule set, custom regex rules, and waivers — so an agent can no longer land a Pydantic model inside a router or a lint suppression (a misplaced *helper* — any top-level function — warns rather than blocks). A tree-sitter validator CLI (Python + TypeScript) classifies every changed definition and emits findings; a `block`-level finding refuses a developer's `i_am_done` and the in-path PR gate's `pr_pass` with the offending `file:line` and a fix hint, and findings surface in QA's review evidence. The auto-derived defaults exclude test and documentation trees, count an explicit `db.commit()` in a route as legitimate (not a fat-route violation), and exempt a small allowlist of structurally-unavoidable framework suppressions (ruff `TC001`–`TC003`, pydantic `prop-decorator`). The committed file and repo scan are read from a dedicated project-level read clone the service ensures on demand — so the standard resolves even for a project created before it existed, with no manual workspace configuration. The file is auto-scaffolded on first clone, editable from a per-project Conventions tab in the panel, and a false positive is cleared by a waiver committed in the branch and reviewed in the PR. Gated by `ROBOCO_CONVENTIONS_ENABLED` (default off) and fully inert when off.
 - **Agent runtime toolchain matching — agents build each target project under the Python that project actually requires.** The agent image bakes one interpreter, but the projects RoboCo builds don't all share it, so a self-gate could pass against the wrong runtime. The workspace now resolves each target's Python from its `requires-python` / `.python-version`, provisions the clone with `uv sync --extra dev --python <version>` (fetching the interpreter on demand), and records a `.git/.roboco-toolchain` marker. A guard refuses a developer's `i_am_done`, QA's `pass_review`, and the PR gate's `pr_pass` when the suite cannot be collected under the provisioned interpreter, so "verifying by reading source" can't masquerade as a passing gate. Gated by `ROBOCO_TOOLCHAIN_MATCH_ENABLED` (default off).
 - **Provider overload circuit-break — a persistent model-API overload parks the provider instead of crash-retrying into it.** A sustained 529/500/503 (the SDK already retries transient ones) now trips the same park-and-probe break as a rate limit: the spawn gate queues further work for that provider and a background loop revives it when the overload lifts, instead of respawning the agent straight back into the failure and burning tokens. Gated by `ROBOCO_OVERLOAD_BREAK_ENABLED` (default on).
 - **Structured content standard with obligated note sections.** Every agent-authored handoff (developer, QA, documenter, PR-reviewer, auditor, PM resumption) is now a validated structured model persisted as the source of truth, with the legacy text column derived from it through a single chokepoint. An anti-soup guard rejects filler and all-token-noise free-text across the flow and content verbs, structured PR-review findings render a generated GitHub comment, and each role's note section is obligated at its lifecycle transition the way journals already were.
+- **User-facing documentation site.** A MkDocs Material site (source under `docs/`) is now built and deployed to GitHub Pages, publishing the organizational blueprint, role descriptions, task lifecycle, and how-to guides at the project's github.io site; the agent-facing RAG corpus under `docs/rag/` stays excluded from the published site. Documenter output is also committed into the project repository (not only the RAG knowledge store) so it ships through the open PR.
 
 ### Changed