chore: remove obsolete config files

Remove configuration files that are no longer used:

- .opencode/rules: OpenCode rules file, superseded by project CLAUDE.md
  and ~/.claude/ rules directory structure
- .roam/fitness.yaml: Roam fitness tracking config, unrelated to this
  project

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

.opencode/rules

@@ -1,50 +0,0 @@
-
-````markdown
-## UBS Quick Reference for AI Agents
-
-UBS stands for "Ultimate Bug Scanner": **The AI Coding Agent's Secret Weapon: Flagging Likely Bugs for Fixing Early On**
-
-**Install:** `curl -sSL https://raw.githubusercontent.com/Dicklesworthstone/ultimate_bug_scanner/master/install.sh | bash`
-
-**Golden Rule:** `ubs <changed-files>` before every commit. Exit 0 = safe. Exit >0 = fix & re-run.
-
-**Commands:**
-```bash
-ubs file.ts file2.py                    # Specific files (< 1s) — USE THIS
-ubs $(git diff --name-only --cached)    # Staged files — before commit
-ubs --only=js,python src/               # Language filter (3-5x faster)
-ubs --ci --fail-on-warning .            # CI mode — before PR
-ubs --help                              # Full command reference
-ubs sessions --entries 1                # Tail the latest install session log
-ubs .                                   # Whole project (ignores things like .venv and node_modules automatically)
-```
-
-**Output Format:**
-```
-⚠️  Category (N errors)
-    file.ts:42:5 – Issue description
-    💡 Suggested fix
-Exit code: 1
-```
-Parse: `file:line:col` → location | 💡 → how to fix | Exit 0/1 → pass/fail
-
-**Fix Workflow:**
-1. Read finding → category + fix suggestion
-2. Navigate `file:line:col` → view context
-3. Verify real issue (not false positive)
-4. Fix root cause (not symptom)
-5. Re-run `ubs <file>` → exit 0
-6. Commit
-
-**Speed Critical:** Scope to changed files. `ubs src/file.ts` (< 1s) vs `ubs .` (30s). Never full scan for small edits.
-
-**Bug Severity:**
-- **Critical** (always fix): Null safety, XSS/injection, async/await, memory leaks
-- **Important** (production): Type narrowing, division-by-zero, resource leaks
-- **Contextual** (judgment): TODO/FIXME, console logs
-
-**Anti-Patterns:**
-- ❌ Ignore findings → ✅ Investigate each
-- ❌ Full scan per edit → ✅ Scope to file
-- ❌ Fix symptom (`if (x) { x.y }`) → ✅ Root cause (`x?.y`)
-````

.roam/fitness.yaml

@@ -1,11 +0,0 @@
-rules:
-  - name: No circular imports in core
-    type: dependency
-    source: "src/**"
-    forbidden_target: "tests/**"
-    reason: "Production code should not import test modules"
-  - name: Complexity threshold
-    type: metric
-    metric: cognitive_complexity
-    threshold: 30
-    reason: "Functions above 30 cognitive complexity need refactoring"