feat(P1): remove gitea/gitlab from synced files + simplify docs (REQ-230,231,232)

Genericize forge-detection code: gitea→forge/generic_forge, GITEA_ACTOR→FORGE_ACTOR.
Drop .gitea byte-identity test assertions (keep GitHub-side + contract conformance).
Add test_no_forge_mentions.py guard test (REQ-230).
Delete completed migration docs (NOVA_MIGRATION.md, NOVA_AWS_MIGRATION.md).
Move NO_HUMANS_THESIS.md to .ciagent/ (internal artifact).
Strip ciagent-internal provenance from synced docs (REQ-/D-/P-/CAP- IDs,
milestone headers, .ciagent/PROJECT.md citations).
Trim README.md (reusable deploy section, local key rotation paragraph).
Fix version-tag drift (@v1.13→@v1.19, acdl/→nova/).

---ci---
project: acdl
phase: 1
milestone: v1.20
status: execute
requirements: [REQ-230, REQ-231, REQ-232]
---/ci---

.ciagent/NO_HUMANS_THESIS.md

@@ -0,0 +1,67 @@
+# Nova — The No-Humans Infrastructure Platform: Thesis Defensibility Brief
+
+> v1.17 — Strategic Direction, Leadership Metrics & Unified Story (REQ-213)
+> Generated: 2026-08-04
+
+## The thesis
+
+Nova is the autonomous infrastructure layer that lets product teams
+ship without engaging an operator, and lets executives trust the AI
+not because it never fails but because every decision is captured,
+scored, and accountable.
+
+**Autonomy in operations; human at stage gates.** The operator is
+removed from the loop of normal operations. Human attestation remains
+required at stage gates — QA signs off for production, SRE greenlights
+based on operational readiness. The absence of an operator is never
+the absence of a record.
+
+## Grounded proof (measurable today)
+
+| Proof | Source | Status |
+|-------|--------|--------|
+| 18 capabilities verified, 4 honestly skipped (0 broken) | `REGRESSION_REPORT.json` | grounded |
+| Decision Ledger captures 100% of AI decisions with outcome backfill | `metrics/decision_ledger.db` | grounded (this milestone) |
+| Attestation Coverage: 100% of prod/dr promotions attested by a human | `hitl_gates.py` + outbox `approver_*` | grounded |
+| Confidence-gated policy engine (not an LLM) — 6 weighted inputs, band outcome | `confidence_signal.py` | grounded |
+| 8-concern attestation matrix with separation-of-duties on prod | `attestation_matrix.py` + `separation_of_duties.py` | grounded |
+| Pre-apply cost estimates (Infracost, offline) | `infracost_adapter.py` | grounded |
+| Test suite passes (~656 tests) | `metrics/test-results.xml` | grounded |
+
+## Deferred proof (measurable when blocking decisions lift)
+
+| Proof | Blocking Decision | Unblock Requirement |
+|-------|-------------------|---------------------|
+| Touchless Resolution Rate ≥99% across production estates | 0 consumers today | Pilot estate activation |
+| Live infrastructure health (ECS, ALB, RPS) | D-096 | Live AWS re-provisioning |
+| Onboarding funnel: requested → granted | D-113/D-114/D-119 | Auto-grant implementation |
+| Drift auto-reversal rate ≥95% | D-096 + no scheduler | Drift detection scheduler |
+| Predictive vs reactive ratio ≥3:1 | future emitter | ML anomaly-forecasting service |
+| Tamper-evident ledger checkpoints (S3 Object Lock + JWS) | D-083 | Audit ledger build-out |
+
+## Anti-claims (what Nova is NOT)
+
+1. **Nova's "AI" is NOT an LLM planner.** It is a confidence-gated
+   policy engine (confidence_signal + HITL gate). The Decision Ledger
+   captures this real decision path — not a fabricated "AI agent" that
+   doesn't exist yet (D-122). When an LLM planner is added, it will emit
+   richer `alternatives_considered` without schema breakage.
+2. **Nova does NOT remove humans from accountability.** Only from
+   operations. Every stage-gate promotion (qa/prod/dr) requires a human
+   attestation recorded with approver identity, separation-of-duties
+   check, and the 8-concern evidence matrix (NORTH_STAR Anti-Goal #3).
+3. **Nova is NOT for legacy, untagged, or freeform infrastructure.** It
+   requires Terraform-managed, policy-aligned, fully-tagged inputs
+   (NORTH_STAR Anti-Goal #4).
+4. **Nova does NOT fabricate metrics.** Every metric is grounded (cites
+   a source file), derived (documented formula), or deferred (cites a
+   blocking decision ID). No fabricated numbers in any deck slide or
+   METRICS.md entry (the "no fabrication" hard constraint).
+
+## What "won" looks like
+
+By month 18, Nova is the layer enterprise leadership points to when
+they say *"we don't have an infrastructure ops team anymore, and the
+audit trail is stronger than it ever was"* — and it is the default
+substrate their AI engineering teams reach for first when an agent needs
+to deploy.