pakka v0.17.0

Hook latency release — closes the v0.12.0 disclosure with every budget passing. New pakka-hot slim binary runs the hot hooks (guard, commit-gate, status-line) without the fat binary's measured startup floor (sqlite init ~4ms via recall + net/http init ~1.8ms via the semantic client): floor p50 9.7ms → 3.8ms, guard p95 under its 10ms budget, commit-gate passthrough p95 4.2ms under its 5ms budget. bin/run routes automatically with fallback to pakka-core. Status-line additionally caches per-project-dir resolution by mtime — unchanged dirs cost zero file opens and zero git execs per render (closes #36). Evidence: benchmarks/latency-v0.17.0.md. Ten binaries shipped (core + hot per platform), all CI-built with SLSA provenance attestation, SHA256SUMS, CycloneDX SBOMs.