Consolidate workspace into single crate v0.2.0: parking_lot mutex, HashTable-based LockMap, unified Entry

[Copilot]

Merge lockmap, lockmap-core, and lockmap-lru into a single lockmap crate. Replace custom futex mutex with parking_lot::RawMutex. Rewrite LockMap to use HashTable with key+hash stored in State (matching LruLockMap design).

Structural changes

• Workspace → single crate. lockmap-core and lockmap-lru deleted.
• LockMap and LruLockMap exported from lockmap crate at v0.2.0

LockMap rewrite

• ShardsMap<K, HashMap> → Vec<ShardMap> with hashbrown::HashTable<AliasableBox<State<K, V>>>
• Key and pre-computed hash stored in State; hashed once per operation, upper 32 bits select shard
• EntryByVal / EntryByRef → unified Entry (key read from State via entry.key())
• CAS-loop fast path in Entry::drop avoids shard lock when entry still has value or other refs

Mutex replacement

• Custom futex (lockmap-core::Mutex) + atomic-wait → parking_lot::RawMutex

Docs

• README: unified API docs, changelog, migration table from 0.1.x → 0.2.0

// Before (0.1.x)
use lockmap::EntryByVal;        // or EntryByRef
use lockmap_lru::LruLockMap;

// After (0.2.0)
use lockmap::{Entry, LockMap, LruLockMap, LruEntry};

---

✨ Let Copilot coding agent set things up for you — coding agent works faster and does higher quality work when set up for your repo.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (dccccdb) to head (3b7314c).
⚠️ Report is 1 commits behind head on main.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##              main       #30    +/-   ##
==========================================
  Coverage   100.00%   100.00%            
==========================================
  Files            4         2     -2     
  Lines         1818      1533   -285     
==========================================
- Hits          1818      1533   -285     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[Copilot]

Pull request overview

This PR consolidates the lockmap workspace of three crates (lockmap, lockmap-core, lockmap-lru) into a single lockmap v0.2.0 crate. It rewrites LockMap to use hashbrown::HashTable with key+hash stored in State (matching the LruLockMap design), unifies the two entry types into a single Entry, and replaces the custom futex mutex with parking_lot::RawMutex.

Changes:

• Restructure from a Cargo workspace to a single crate, moving lockmap.rs and lru_lockmap.rs into src/ and deleting the three subcrate directories
• Rewrite LockMap internals: replace ShardsMap<K, HashMap> with Vec<ShardMap> using HashTable, store key+hash in State, unify EntryByVal/EntryByRef into a single Entry type with a CAS-loop fast path in Drop
• Replace custom futex-based Mutex (from lockmap-core) with parking_lot::RawMutex in both LockMap and LruLockMap

Reviewed changes

Copilot reviewed 15 out of 16 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
Cargo.toml	Workspace → single crate package with updated deps (added parking_lot, removed atomic-wait)
src/lib.rs	New crate root: module declarations + re-exports of LockMap, Entry, LruLockMap, LruEntry
src/lockmap.rs	Major rewrite: HashTable-based storage, unified Entry, CAS-loop drop, RawMutex
src/lru_lockmap.rs	Replace Mutex → RawMutex, update doc imports, streamline comments
README.md	Updated for single-crate structure, added changelog and migration guide
benches/bench_lockmap.rs	Benchmark moved from subcrate to root
lockmap/, lockmap-core/, lockmap-lru/	All deleted (Cargo.toml, lib.rs, README, source files)

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.