chore: release v0.4.0

[solomonneas]

Roll the Unreleased changelog under v0.4.0, bump the crate to 0.4.0, and repoint the README install pin. Tag and GitHub release follow the merge.

Full delta since v0.3.0 (41 commits): schema v5 persisted pending calls, v6 edge confidence, v7 line-independent symbol ids, evaluate/explain/export/watch, dead-code/cycles/affected analyses, branch-drift doctor, optional MCP limit on edge queries (#34), fixture-classification fix (#36), FTS path-separator fix (#38).

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