[kolkov]

v0.1.1 — Subscribe lifecycle fix + allocation optimization

Fixed

• Goroutine leak in Subscribe — each Subscribe call spawned a goroutine that
  blocked for the subscription lifetime. SubscribeForever (context.Background)
  parked it forever. 10k subscriptions = 10k idle goroutines (20-40MB stack waste).
  Replaced with context.AfterFunc — zero goroutines per subscription.
  (signals: drop per-Subscribe goroutine (context.AfterFunc); Once-guard Unsubscribe #6, reported by @AnyCPU)

• Race condition in Unsubscribe — concurrent cancel() + Unsubscribe() could
  both reach close(done) via non-atomic select-default guard, causing
  panic: close of closed channel. Replaced with atomic.Bool.CompareAndSwap
  for idempotent cleanup. (signals: drop per-Subscribe goroutine (context.AfterFunc); Once-guard Unsubscribe #6)

Performance

• Signal_Subscribe: 745 ns → 134 ns (5.6x faster), 224B → 52B (−77% memory)
• Effect_Create (1 dep): 1560 ns → 352 ns (4.4x faster), 384B → 196B, 10 → 7 allocs
• Effect_Create (3 deps): 4620 ns → 726 ns (6.4x faster), 1016B → 388B, 24 → 13 allocs
• Effect_Stop: OOM → 330 ns (goroutine accumulation eliminated)
• AsReadonly(): cached after first call (zero allocs on subsequent calls)

Added

• Allocation regression tests using testing.AllocsPerRun — deterministic, breaks
  build if heap allocations increase
• Subscribe lifecycle regression tests — goroutine leak detection (10k held subs)
  and concurrent cancel+unsub race condition
• Cached AsReadonly() — returns same pointer on every call
• Dual-path Effect — avoids wrapper closure allocation for effects without cleanup

Removed

• scripts/ directory (unused pre-release check scripts)

Test plan

• 69 tests passing (59 existing + 10 alloc assertions)
• Race detector clean (CI on ubuntu/macOS/windows)
• Goroutine leak regression: 10k held subs = 0 goroutines
• Concurrent cancel+unsub: no panic under -race
• All benchmarks show improvement, zero regressions
• go vet clean, gofmt clean

Closes #6

[codecov]

Codecov Report

❌ Patch coverage is 84.31373% with 8 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
effect.go	83.33%	2 Missing and 3 partials ⚠️
computed.go	66.66%	2 Missing and 1 partial ⚠️

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