- **Automatic stage profiling (Issue #58, RFC 014)**: New `profiling` feature on `aimdb-core` automatically measures wall-clock time per `.source()` / `.tap()` / `.link()` stage and exposes `call_count` / `total` / `avg` / `min` / `max` counters per stage. Name stages with `RecordRegistrar::with_name("...")`. Works on `no_std + alloc` via the runtime clock (`aimdb_executor::TimeOps`) and `portable-atomic` for 64-bit atomics on `thumbv7em`. New MCP tools `get_stage_profiling` (with bottleneck detection + recommendation) and `reset_stage_profiling`. Feature is off by default and zero-cost when disabled. ([aimdb-core](aimdb-core/CHANGELOG.md), [aimdb-executor](aimdb-executor/CHANGELOG.md), [aimdb-tokio-adapter](aimdb-tokio-adapter/CHANGELOG.md), [aimdb-embassy-adapter](aimdb-embassy-adapter/CHANGELOG.md), [aimdb-wasm-adapter](aimdb-wasm-adapter/CHANGELOG.md), [aimdb-client](aimdb-client/CHANGELOG.md), [tools/aimdb-mcp](tools/aimdb-mcp/CHANGELOG.md))
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