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---

docs/presentations/README.md

@@ -69,7 +69,7 @@ Synthesize the full markdown into a lean Marp deck:
 
 Both formats are derived from the Marp deck. **HTML is committed to the repo**
 (viewable in any browser, self-contained with base64-embedded images). **PPTX
-is uploaded to the Gitea release** as a downloadable attachment (binary, not
+is uploaded to the release** as a downloadable attachment (binary, not
 committed to git).
 
 #### HTML export (committed to repo)
@@ -90,7 +90,7 @@ file that renders the full deck with the S&P Global Energy theme.
 committed artifacts, not generated on-the-fly — they must be re-rendered and
 re-committed when the Marp deck is updated.
 
-#### PPTX export (uploaded to Gitea release)
+#### PPTX export (uploaded to release)
 
 ```bash
 CHROME_PATH=/root/.cache/ms-playwright/chromium-1217/chrome-linux64/chrome \
@@ -102,7 +102,7 @@ CHROME_PATH=/root/.cache/ms-playwright/chromium-1217/chrome-linux64/chrome \
 The `--allow-local-files` flag is **required** for PPTX export so the local
 PNG diagrams are embedded in the file. As of v1.18 (REQ-228, D-141), PPTX
 files **are committed to the repo** as first-class binary artifacts (no LFS)
-and are also attached to the phase's Gitea release via
+and are also attached to the phase's release via
 `scripts/attach_release_asset.py`. The render + commit + attach pipeline is
 automated by `scripts/render_deck.sh`.
 
@@ -300,7 +300,7 @@ diagram images in `assets/png/`). The resulting HTML is self-contained.
 **The HTML files are committed artifacts** — re-render and re-commit whenever
 the Marp source changes.
 
-### Export a Marp deck to PPTX (uploaded to Gitea release)
+### Export a Marp deck to PPTX (uploaded to release)
 
 ```bash
 CHROME_PATH=/root/.cache/ms-playwright/chromium-1217/chrome-linux64/chrome \
@@ -311,7 +311,7 @@ CHROME_PATH=/root/.cache/ms-playwright/chromium-1217/chrome-linux64/chrome \
 
 `--allow-local-files` is **required** for PPTX so local PNG diagrams are
 embedded in the file. PPTX files are not committed to git — upload them as
-attachments to the Gitea release.
+attachments to the release.
 
 ## Adding a new presentation
 
@@ -324,7 +324,7 @@ attachments to the Gitea release.
    no speaker notes, embedded PNGs, and maturity badges.
 4. **Render to HTML** with `--allow-local-files` and commit the HTML to
    `docs/presentations/<deck-name>.html`.
-5. **Render to PPTX** with `--allow-local-files` and upload to the Gitea
+5. **Render to PPTX** with `--allow-local-files` and upload to the release
    release (do not commit PPTX to git).
 6. **Distill the talking points** as `<deck-name>-talking-points.md` — one
    section per Marp slide, 3-6 talking point bullets + key takeaway, content
@@ -352,4 +352,4 @@ attachments to the Gitea release.
 > deck with a 5-act arc (Problem → Vision → How → Proof → Roadmap). v1.18
 > (REQ-226) adds 3 slides (17 Scope, 18 RACI, 19 Atelier) → 21 total. The
 > S&P Global Energy theme is restored (REQ-214, P1). PPTX is committed to
-> git + attached to the Gitea release (REQ-228, D-141).
+> git + attached to the release (REQ-228, D-141).