chore: bump version to 5.2.2 and consolidate changelog

PR A's [Unreleased] block is folded into the [5.2.2] entry, with the
shutdown re-arm fix from this PR added under Fixed (covers both the
single-UPS and multi-UPS coordinator paths).

Single 5.2.2 release covers both PRs: TUI usability fixes (#40) and
the shutdown re-arm fix for bug #4 (#41).

Co-Authored-By: Claude Opus 4.7 <[email protected]>

Author: m4r1k

docs/changelog.md

@@ -7,39 +7,53 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ---
 
-## [Unreleased]
+## [5.2.2] - 2026-04-28
+
+TUI usability fixes plus one safety-critical re-arm fix on the shutdown
+state machine. Drop-in upgrade.
 
 ### Fixed
-- **`eneru tui --graph voltage` was silently ignored in interactive mode.**
-  The CLI flag now seeds the initial graph metric (and `--time` seeds the
-  initial window) even without `--once`. Pressing `<G>` / `<T>` still cycles
-  from there.
-- **A single phantom 0V sample squashed the voltage band into a one-pixel
-  strip at the top of the graph.** Two layers of fix: the writer drops
-  on-line `input.voltage <= 0` rows at sample time (with `ups.status` in
-  context, so real outages — `OB` / `FSD` — still record a legitimate dip
-  to 0V), and the graph panel auto-scales unbounded metrics from the
-  5th/95th percentile so any leftover outliers don't dictate the band.
+- **Shutdown trigger never re-armed after `POWER_RESTORED`** when the
+  local-shutdown command failed to actually halt the host (custom
+  no-op command, sandboxed environment, dummy-UPS test rig — bug #4).
+  Subsequent on-battery transitions silently no-op'd at the flag-file
+  gate. The handler now clears the flag on the OB/FSD → OL transition,
+  and `MultiUPSCoordinator` resets its in-memory lock + global flag in
+  the same hook so multi-UPS deployments re-arm too. Gated re-triggers
+  also log a warning so the no-op is no longer silent.
+- **`eneru tui --graph voltage` silently ignored in interactive mode.**
+  The CLI flag now seeds the initial graph metric, and `--time` seeds
+  the initial window; `<G>` / `<T>` cycle from there.
+- **A single phantom 0 V sample squashed the voltage band into a
+  one-pixel strip at the top of the graph.** Writer drops on-line
+  `input.voltage <= 0` rows at sample time (real outages — `OB`/`FSD`
+  — still record the legitimate dip to 0 V); graph panel auto-scales
+  unbounded metrics from the 5th/95th percentile so any leftover
+  outliers don't dictate the band.
 
 ### Added
-- **`--verbose` / `-v` flag** on `eneru tui` (live + `--once`): widens the
+- **`--verbose` / `-v`** on `eneru tui` (live + `--once`): widens the
   events filter to include low-priority chatter alongside the priority
-  defaults. The live TUI also gains a `<V>` keybind to toggle in-session.
-- **`--full-history` flag** for `eneru tui --once`: ignore the `--time`
+  defaults. Live TUI gains a `<V>` keybind to toggle in-session.
+- **`--full-history`** for `eneru tui --once`: ignore the `--time`
   window and query the events table from the beginning. Rejects with
-  ``error: --full-history requires --once`` (exit 2) if combined with the
-  live TUI.
+  `error: --full-history requires --once` (exit 2) when combined with
+  the live TUI.
 
 ### Changed
-- **Events panel now defaults to priority-only** in both live TUI and
-  `eneru tui --once --events-only`. Daemon lifecycle, shutdown triggers,
-  and power transitions surface; per-condition chatter
-  (`VOLTAGE_FLAP_SUPPRESSED`, etc.) is hidden. Migration: scripts that
-  grep the `--once --events-only` output for low-priority event types
-  must add `--verbose`.
+- **Events panel defaults to priority-only** in both live TUI and
+  `eneru tui --once --events-only`. Daemon lifecycle, shutdown
+  triggers, and power transitions surface; per-condition chatter
+  is hidden. Scripts that grep `--once --events-only` for
+  low-priority event types must now pass `--verbose`.
 - Live TUI events panel default cap raised from 8 to 20 rows so a few
   voltage transitions don't push the daemon-level history off-screen.
 
+### Migration notes
+None for the package install. Scripts parsing `eneru tui --once
+--events-only` output: add `--verbose` if you rely on seeing
+low-priority event types (voltage flaps, etc.).
+
 ---
 
 ## [5.2.1] - 2026-04-24

src/eneru/version.py

@@ -2,4 +2,4 @@
 
 # Version is set at build time via git describe --tags
 # Format: "5.2.1" for tagged releases, "5.2.1-5-gabcdef1" for dev builds
-__version__ = "5.2.1"
+__version__ = "5.2.2"