chore(voyage): track STATE.md per global continuity rule

Workstream A of the marketplace-wide rollout (catalog/docs/state-version-rollout.md):
STATE.md is tracked + committed, pushed to private Forgejo, never GitHub/public.
Brings voyage in line with config-audit + ms-ai-architect (already done).

- .gitignore: remove both STATE.md ignore lines (the file was ignored twice, at
  the dedicated block and the session/local-state block); replace the comments
  with a tracked-state note mirroring config-audit. `.claude/`/projects +
  `*.local.*` stay gitignored.
- STATE.md: now tracked; fix its two self-references that still claimed
  "gitignored / unresolved discrepancy" — the S31 discrepancy is resolved.

Verify: `git check-ignore STATE.md` exits non-zero; `git ls-files STATE.md`
prints; no bare STATE.md line remains in .gitignore.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01LqBYc8Ltrk7LipyJmGxXiB

.gitignore

@@ -19,8 +19,8 @@ blob-report/
 # Local configuration / session files
 *.local.*
 
-# STATE.md — current state-of-play (overskrives ved sesjonsslutt, gitignored per ~/.claude/CLAUDE.md).
-STATE.md
+# STATE.md — current state-of-play. TRACKED continuity per ~/.claude/CLAUDE.md
+# (overrides the polyrepo gitignore convention); pushed to private Forgejo, never public.
 
 # Local planning docs (briefs, design notes, observations) — never committed.
 # Existing tracked files in docs/ predate this rule; new planning docs stay local.
@@ -30,8 +30,7 @@ docs/ultracontinue-design-notes.md
 # Ultraplan project directories — briefs, research, plans, progress all local.
 .claude/projects/
 
-# --- session/local state (gitignored per ~/.claude polyrepo-konvensjon) ---
-STATE.md
+# --- session/local state (gitignored) — STATE.md er nå tracked, se ~/.claude/CLAUDE.md ---
 REMEMBER.md
 ROADMAP.md
 TODO.md