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eece6344fc
Adds the per-language feature flag primitive that gates the Ring 3
registry-primary rollout. Single source of truth for whether a given
language uses `Registry.lookup` (new) or the legacy DAG (current).
## Shipped
### `gitnexus/src/core/ingestion/registry-primary-flag.ts`
- `isRegistryPrimary(lang): boolean` — reads
`REGISTRY_PRIMARY_<UPPER(enum-value)>` from `process.env`.
- `envVarNameFor(lang): string` — exposed for CI tooling that
cross-references flag flips (and for test assertions).
- `primaryLanguages(): ReadonlySet<SupportedLanguages>` — all
currently-on languages; useful for startup logging + the #923
shadow dashboard which distinguishes "primary: legacy" vs
"primary: registry" rows.
### Contract
- Default: `false` for every language. A language must explicitly
opt in by setting its env var.
- Truthy: `'true'`, `'1'`, `'yes'` (case-insensitive, whitespace-
trimmed). Anything else — typos, empty string, `'off'` — is
`false`. Fail-safe posture: a misspelled flag doesn't accidentally
flip a language.
- No per-process caching. `process.env` is read per call; overhead
is negligible (one lookup per file at resolution time), and
test isolation is lexical (no cache-reset coordination).
### Env-var mapping
Uses the enum VALUE, not the TS key, for the env-var suffix:
- `SupportedLanguages.Python` → `REGISTRY_PRIMARY_PYTHON`
- `SupportedLanguages.CPlusPlus` → `REGISTRY_PRIMARY_CPP` (value `'cpp'`)
- `SupportedLanguages.CSharp` → `REGISTRY_PRIMARY_CSHARP`
Users flip languages by their canonical name, not the TS symbol.
## Tests (16, all passing)
- `envVarNameFor` (3): upper-casing · enum-VALUE-not-KEY mapping ·
all-languages uniqueness smoke-test
- `isRegistryPrimary` (9): default false · `'true'` / `'1'` / `'yes'`
truthy · mixed-case + whitespace-padded · falsy-looking values ·
unrecognized tokens (typo-safe) · per-language isolation · no
stale cache on mid-process mutation · CPlusPlus mapping
- `primaryLanguages` (3): empty · exact membership · Set instanceof
Tests scrub every `REGISTRY_PRIMARY_*` env var in `beforeEach` +
`afterEach` so parallel vitest runs on the same process don't bleed state.
## What's NOT in this PR (deferred by design)
The actual integration in `call-processor.ts` belongs in #921
(finalize-orchestrator). Reason: the "new path" requires a populated
`SemanticModel` to call `Registry.lookup` against, and the model
becomes accessible only after #921 orchestrates finalize. Wiring a
dead branch now would just get rewritten then.
This PR ships the flag primitive in isolation so #921 has a clean,
tested utility to consult — and so `#923` (shadow harness) has a
stable boolean to read for its "which row is primary?" rendering.
## Closes part of #909. Unblocks
- #921 finalize-orchestrator — can now consult `isRegistryPrimary`
at resolution time
- #923 shadow harness — can distinguish primary-flipped rows
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| .. | ||
| fixtures | ||
| helpers | ||
| integration | ||
| unit | ||
| utils | ||
| global-setup.ts | ||
| vitest.d.ts | ||