Release 0.5.1

Release 0.5.1

Date: 2026-09-12

v0.5.1 is the hardening release following v0.5.0's temporal-delta, tokenizer-budget, and layered-recovery work.

Main changes

Vault lifecycle

• O(1) total-byte accounting instead of scanning SUM(byte_count) for every new write.
• Configurable high/low watermarks.
• Retention telemetry.
• Active temporal references protected from GC.
• Accepted provider-visible recovery references and temporal delta artifacts protected from GC.

Correctness

• Unified five-turn recent-inline default.
• Collapse-window invariant enforced in direct config, environment loading, and compactor behavior.
• Unicode-safe case-insensitive artifact search.
• RTK rewrite cache scoped by command + canonical cwd.
• Async temporal-delta parity.

Measurement

• Same-mode comparisons rejected.
• Prompt-fingerprint/model groups aggregated rather than arbitrary zip() pairing.
• Eligible/paired/unpaired observations reported.
• Deterministic 95% bootstrap intervals.
• Exact native/temporal token savings used when a tokenizer is available; fallback estimates are labelled.

Schema / security / portability

• terminal_snapshots moved into storage schema management.
• Existing parent directories are not forcibly chmodded.
• Windows read-only SQLite URI handling fixed.
• Optional RTK executable pinning.
• Documentation expanded for compaction, retention, token budgeting, and trust boundaries.

Verification

The final tree passed the permanent CI matrix on:

• Python 3.10
• Python 3.11
• Python 3.12
• Python 3.13
• Windows
• Rust fmt/Clippy/tests/rustdoc
• package build, Twine checks, and release-content verification

A focused final verification reported 174 passed, 2 skipped.