feat(bsky): EXPECTED_NA['upgrade'] suppresses the upgrade-tier base deploy — single deploy = PR head; bluesky-pds declares it (no deployable base: every published tag pins the republished moving :0.4). upgrade_base() extracted pure + 6 unit tests; meta-key doc regenerated. 253 unit tests + repo lint PASS

runner/harness/meta.py

@@ -76,7 +76,7 @@ KEYS: tuple[Key, ...] = (
         "EXPECTED_NA",
         "dict",
         None,
-        "Declare a non-run rung an INTENTIONAL skip: `{rung: reason}` — the level climbs past it; an undeclared non-run rung is *unverified* and blocks the level above it (classification table: machine-docs/DECISIONS.md phase lvl5). Never overrides an exercised pass/fail; the `lint` rung has no escape hatch.",
+        "Declare a non-run rung an INTENTIONAL skip: `{rung: reason}` — the level climbs past it; an undeclared non-run rung is *unverified* and blocks the level above it (classification table: machine-docs/DECISIONS.md phase lvl5). Never overrides an exercised pass/fail; the `lint` rung has no escape hatch. Declaring `upgrade` also suppresses the upgrade-tier BASE deploy — the single deploy is the PR head itself — for recipes whose published versions exist but are genuinely undeployable (phase bsky).",
     ),
     Key(
         "READY_PROBE",