chore: release v2.21.0

[jdx]

🤖 New release

• pitchfork-cli: 2.20.0 -> 2.21.0

Changelog

2.21.0 - 2026-08-05

Added

• (config) add mtime-based cache for config parsing (#711)
• (start) interactive daemon selection via demand multi-select (#709)

Fixed

• (deps) update rust crate rmcp to v3 (#725)
• (deps) update rust crate clap_usage to v5 (#724)

Other

• (deps) update rust crate tera to v2.1.0 (#722)
• (deps) update rust crate schemars to v1.2.2 (#716)
• (deps) update rust crate tokio-stream to v0.1.19 (#717)
• (deps) update rust crate mdns-sd to v0.20.3 (#715)

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This PR was generated with release-plz.

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Note

Low Risk
Mechanical version and documentation sync only; no application logic changes in this diff.

Overview
Release-only PR that cuts v2.21.0 for pitchfork-cli: bumps the crate version in Cargo.toml / Cargo.lock, syncs the reported CLI version in generated usage docs (pitchfork.usage.kdl, docs/cli/*), and adds the [2.21.0] section to CHANGELOG.md.

That changelog section (from already-merged work, not new code in this diff) highlights mtime-based config parse caching, interactive multi-select when starting daemons, and dependency bumps including rmcp v3 and clap_usage v5.

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Instruction counts

benchmark	trend	instructions	Δ	wall (min)	Δ
schema	▁▄▁▂▄▄▄▅▃▅▆▇▇██	5,023,346 → 5,023,082	-0.01%	4.03 → 3.69ms	-8.57%
usage	▂▁▁▂████▇█▆▆▆▄▄	15,064,734 → 15,066,650	+0.01%	4.88 → 5.04ms	+3.15%

No instruction-count regression above 1%.

_{Only instruction counts gate. Wall clock is shown for context — on identical hardware it moves 4-20% run to run.}

_{Measured by tak — instruction-counted CLI benchmarks, stored in this repository's git notes.}

_{db1992e3a451 vs 78a7042b69dd · measured on the runner, not pushed to the history.}