docs: #127 CLOSED — the brick was hypridle eating its own resume path

The incident was misdated: it did not happen before 12:51:34 Jul 15
(that boot was healthy all day) — it ended the previous boot at 10:54:22
with the power button. In that boot, running the pre-fix generation:
idle cascade on schedule (lock 10:21, dpms off 10:26, suspend correctly
skipped on AC), then hypridle logs "BUG THIS: inhibit locks < 0: -1" at
10:36:29 and its rule state is corrupted from there — the fired DPMS
listener's on-resume, then the session's ONLY dpms-on caller, never
dispatches again despite provable real input (two blind hyprlock PAM
attempts) and three output remove/re-add cycles. The wedged-compositor/
DRM-master lead is contradicted: Hyprland tracked hotplug live through
the whole window, PAM worked, kernel spotless. The shipped fix (a2151f4,
input wakes DPMS compositor-side) closes exactly this mechanism.

Filed upstream with the full trace: hyprwm/hypridle#208 (0.1.7; their
closed #104/#128 are the same class). Watch folded into #146.

Sweep: BACKLOG #127 deleted (NOW keeps only the install-findings context
stub, flagged to Bernardo); ROADMAP gains "The idle brick's CAUSE found"
and both stale "cause still open" tails patched; checked-off #127
HARDWARE-QUEUE blocks pruned, their method lessons moved to MEMORY
§ Gotchas.

Verification: V0 (docs/backlog only). The evidence is journal forensics
on the incident hardware (two Sonnet passes, verdict on Fable), quoted
in the ROADMAP entry; the fix itself was V3-proven 2026-07-16.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

agent/MEMORY.md

@@ -137,6 +137,14 @@ iteration would otherwise rediscover.
   without a hierarchy pass.
 
 ## Gotchas (cost a debugging session once)
+- **#127 forensics/method lessons (three wrong diagnoses' worth):** drive the
+  real code path or measure nothing (a hand-run `dpms off` has no wake path
+  watching it, so "input didn't wake it" was guaranteed); do not read output
+  lists as lid positions — `/proc/acpi/button/lid/*/state` is the evidence
+  (a reload can light a panel inside a shut lid, #148); and anchor forensics
+  on the right boot — an *unclean boot end* (journald corruption + dirty bit
+  on the next boot) is itself the incident marker, and `--list-boots` comes
+  before any grep.
 - **OVMF exposes /dev/fd0 as TYPE=disk (#112):** disk picker must exclude
   `/dev/fd*` and tiny sizes; sort largest-first or blind Enter picks floppy.
 - **Live ISO offline theme switch (#113):** only the *default/pinned* HM