docs(changelog): strip tracker IDs and fold Unreleased-only fixes

Cleaned up the [Unreleased] sections of CHANGELOG.md and
packages/hypergumbo-tracker/CHANGELOG.md so they read like the released
sections.

Stripped from inline parentheticals:
- WI-xxxxx / INV-xxxxx tracker IDs (authorship attribution, unresolvable
  outside the tracker)
- UAT BUG-NN / DQ-NN / UX-NN codes (dev-wearing-user-hat exercise, not
  an external audit)
- Phase/Slice suffixes ("Phase 2 Slice A", "Slice B-first")
- "follow-up to WI-X" chains

Kept: ADR references (e.g. ADR-0014 §3, ADR-0003-ext), numeric results
(94.0% → 43.5%, 312 primitives), named helpers/modules/flags.

Folded Fixed entries that were correcting Unreleased-only work into
their Added/Changed bullets so the top-of-section description reflects
the final form:
- rust-analyzer CI wiring + scip_pb2 coverage omit → implicit in
  Rust analyzer backend entries; csharp-grammar-0.23.5 fix retained as
  a real pre-existing fix
- test-agent-infra full-suite job wiring details → dropped (already
  described in Added)
- auto-pr .ops backup/restore + dotglob restore merged into one bullet
- supervisor rate-limit cap (8 → 24), graceful-exit wait fix → rolled
  into the daemon's Added description (rate-limited at 24/24h,
  auto-shutdown after 20 saturation ticks, graceful-exit polls
  has-session)
- watched-process over-match fix → rolled into Changed entry for the
  process-aware pause

Docs-only; no runtime code touched.

Signed-off-by: jgstern-agent <josh-agent@iterabloom.com>

Author: jgstern-agent

.ci/affected-tests.txt

@@ -1,5 +1,5 @@
 # Test selection manifest
-# Generated by smart-test at 2026-04-21T03:11:01-04:00
+# Generated by smart-test at 2026-04-21T03:58:32-04:00
 # Mode: targeted
 # Baseline: 7484e9d523ac1b77f43a4fe71a90c54c5aa6864d
 # Changed files: 8