docs: 0.12.0 release baseline — dbt wave, 0.7.5 GA, lineage verify

[fas89]

Brings the docs to the v0.12.0 CLI baseline. Every claim was verified against the v0.12.0 git tag of forge-cli (not main), and the drift gate was run against the real PyPI 0.12.0 wheel.

What changed

• docs/RELEASE_NOTES_0.12.0.md (new, flagship): schema 0.7.5 promoted to stable/GA (default for untagged contracts; 0.7.6 opens as preview; one-time plan/bundle digest churn for untagged contracts called out under Compatibility), the full dbt wave (fluid import dbt, --model-contracts, MetricFlow semantic_models+metrics bridge, packages.yml + sources.yml freshness emission, run_results.json → run records + verify checks, Fusion/dbt Core v2 detection, --dbt-tests-key/FLUID_DBT_TESTS_KEY), fluid verify --reconcile-lineage, and the fixed/internal items (copilot enrichment slots, test-mapper consolidation, CI split, Docker CVE gate). Wired into the Project nav (newest first).
• docs/.vuepress/cli-version.json: supportedCliVersion / supportedCliInstallSpec → 0.12.0. supportedFluidContractVersion stays 0.7.5 (now GA).
• docs/cli/import.md: new "Importing a dbt project" section (real flags from the tag; ImportReport shape; dbt parse first; catalog.json overlay; manifest v9 floor). Also removed a stale "Coming in the next release" tip about the 0.8.3 ingestion importers.
• docs/cli/verify.md: documented --reconcile-dbt (announced in the 0.11.0 notes but never added to this page), --reconcile-lineage (3 drift classes + severity table), --warn-only, and the new dbt transformation checks (dbt_tests_passed / no_error_severity_failures). The differing exit-code gating of the two reconcile legs (dbt drift gates independent of --strict; lineage criticals gate only under --strict) matches cli/verify.py at the tag.
• docs/cli/generate-vector.md: preview framing → stable-since-0.12.0; vectorConfig is default-available.
• docs/advanced/environment-variables.md: header → v0.12.0; added DBT_EXECUTABLE and FLUID_DBT_TESTS_KEY (flag > env > auto precedence verified at the tag).
• docs/README.md: the "Current release" tip still said 0.10.0 and (incorrectly) that 0.7.5 was already GA — rewritten to the 0.12.0 baseline.
• docs/RELEASE_NOTES_0.11.0.md: status line → "Superseded by 0.12.0".
• scripts/cli-docs-allowlist.yml pruned against the installed 0.12.0 wheel (see below).

Allowlist prunes (verified by introspecting register_core_commands in the installed 0.12.0 wheel)

• Pruned from docs_only_ok — now real top-level commands with existing pages: runs, retention, secrets, stats, contract, ship, mcp, memory, roadmap, scaffold-ide, and skills (the swapped-args registration bug noted in the old comment is fixed at 0.12.0).
• Pruned from undocumented_ok — no longer registered at all: context (the hidden config alias is gone), preview.
• Kept export-odps in docs_only_ok with a corrected comment: contrary to the old "remove once ≥0.8.4" note, export-odps is NOT a registered command at 0.12.0 — the 0.10.0 provider→exporter reclassification retired it in favour of fluid generate standard --format odps-v4.1; only the deprecated export-opds alias still registers (kept in undocumented_ok).

Verification

Drift gate against the real PyPI wheel (data-product-forge==0.12.0 in a clean python3.12 venv), with the pruned allowlist:

OK: fluid CLI version matches docs (0.12.0).
OK: `fluid init --quickstart` emits fluidVersion 0.7.2 (matches pin).
OK: all 68 CLI subcommands are documented (docs/cli/ has 68 pages).

docs/.vuepress/config.ts parses (node readFileSync sanity) and all relative links in the changed pages resolve.

Inaccuracies found in existing pages (for the record)

• docs/README.md claimed "Schema 0.7.5 remains the GA default" at 0.10.0 and docs/RELEASE_NOTES_0.9.0.md claims 0.7.5 was "promoted to GA" in 0.9.0 — the CLI ground truth (schema_manager.py at tags v0.10.0–v0.11.0) shows 0.7.5 stayed in PREVIEW_VERSIONS until v0.12.0. README fixed here; the historical 0.9.0 notes were left as-is.
• Older release-notes pages (0.10.0 and earlier) all still say "Current stable docs baseline" — only the immediately-superseded 0.11.0 page was corrected here.