Merge pull request #150 from dmoliveira/loopmux-br-3ak-release-docs

Refresh v0.1.40 draft notes and prep references

Author: dmoliveira

docs/changelog.md

@@ -82,3 +82,8 @@
 - Release published: `https://github.com/dmoliveira/loopmux/releases/tag/v0.1.39`.
 - Tag: `v0.1.39`.
 - Preflight and publish checks passed: `cargo fmt --check`, `cargo test -q` (136 passed), `cargo clippy -- -D warnings`, `make smoke-post-release`.
+
+### v0.1.40 Prep References
+- PR #147: Kick off v0.1.40 milestone and release scaffolds (`https://github.com/dmoliveira/loopmux/pull/147`)
+- PR #148: Add fleet heartbeat telemetry for active vs idle loop behavior (`https://github.com/dmoliveira/loopmux/pull/148`)
+- PR #149: Expand cadence and stop-state regression defenses (`https://github.com/dmoliveira/loopmux/pull/149`)

docs/release/v0.1.40-draft.md

@@ -8,10 +8,12 @@
 - Added `docs/plan/v0.1.40-milestone.md` to track scope and acceptance criteria.
 
 ## Changes
-- TBD: summarize behavior and telemetry refinements merged during v0.1.40.
+- Added bounded fleet heartbeat telemetry that classifies loop progress as `activity=active|idle` using send deltas across heartbeat windows.
+- Preserved low-noise cadence by emitting heartbeat snapshots only after a poll-scaled interval threshold.
 
 ## Fixes
-- TBD: summarize regression defenses and correctness fixes merged during v0.1.40.
+- Added stop-state heartbeat metric coverage to ensure `state=stopped` remains explicit during idle windows.
+- Added hold-action regression coverage for pause-while-holding and hold-toggle-enter transitions.
 
 ## Validation
 - `cargo fmt --check`
@@ -20,6 +22,9 @@
 
 ## Included Pull Requests
 - `#146` Post-release: bump to 0.1.40-dev and record v0.1.39 evidence
+- `#147` Kick off v0.1.40 milestone and release scaffolds
+- `#148` Add fleet heartbeat telemetry for active vs idle loop behavior
+- `#149` Expand cadence and stop-state regression defenses
 
 ## Release Execution
 - Use `docs/release/v0.1.40-runbook.md` for preflight, tag/publish, verification, and post-release steps.