T15, T16 — docs build and static checks

2026-10-13, branch loop/issue-36.

T15: cd docs && bun run docs:build

build complete in 21.13s.
exit=0

The build fails on a dead link, so the new pages' links (sdk/mount.md, configuration/agent.md, the deploy and server pages) resolve.

T16: uv run pre-commit run --all-files

ruff (lint + autofix)....................................................Passed
ruff (format)............................................................Passed
pyright (type check).....................................................Passed
pytest (unit tests)......................................................Passed
markdownlint.............................................................Passed
exit=0

The first run failed markdownlint MD012 (a double blank line at the end of evidence/integration.md). The fix is in the same commit, and this is the rerun.