docs(P00): v0.8 research findings + persona assessment

RESEARCH_v0.8.md (35KB): per-package coverage strategy for 9 pkgs,
SSH trust research (uncovered latent TOFU capture bug + unpopulated
HostKeyFingerprint field), verify-reqs Go program approach, 4 ADs,
10 pitfalls. PERSONAS.md updated for v0.8 (3-persona roster retained,
connectrpc removed from backend frameworks per AD-014, territory globs
aligned to actual file structure).

Key findings flagged for PLAN:
- proxmox needs sessionRunner seam (~10 LOC) or stalls at ~55%
- cert_repo_test.go missing (v0.7 P01 leftover) blocks store 70%
- TOFU known_hosts capture broken + HostKeyFingerprint never populated
  (bootstrap.go:195-198) — P02 fixes both
- verify-reqs = Go program at cmd/verify-reqs (~80 LOC, stdlib only)

---ci---
project: orca
phase: 0
milestone: v0.8
status: research
---/ci---

.ciagent/CHECKPOINT.json

@@ -1,11 +1,11 @@
 {
   "phase": 0,
-  "stage": "clarify",
+  "stage": "research",
   "milestone": "v0.8",
   "milestone_slug": "coverage-trust-hardening",
   "phase_role": "pre_execution",
   "attempts": 0,
-  "updated_at": "2026-08-04T00:44:00Z",
+  "updated_at": "2026-08-04T00:45:00Z",
   "milestone_complete": false,
   "next_milestone": null
 }