feat(cli): seed correlation id from ATK_CLI_CORRELATION_ID env var

[JimmyCalhoun]

What

Lets a parent process that spawns the ATK CLI as a subprocess (e.g. the wiqd CLI) thread its own correlation id into this run, so both products' telemetry share one join key per invocation.

  // packages/fx-core/src/common/correlator.ts
- static setId(): string {
-   const id = uuid.v4();
+ static setId(id?: string): string {
+   const newId = id && uuid.validate(id) ? id : uuid.v4();

  // packages/cli/src/commands/engine.ts  (start())
- Correlator.setId();
+ Correlator.setId(process.env.ATK_CLI_CORRELATION_ID);

• Correlator.setId(id?) now adopts a valid externally-supplied UUID and falls back to a freshly minted UUID when the value is absent or malformed (uuid.validate), so the correlation id is always well-formed.
• The CLI entrypoint seeds it from process.env.ATK_CLI_CORRELATION_ID. This makes ATK's native correlation-id (already stamped on every telemetry event) equal the parent's id — no new dimension, no schema change.

Why

As wiqd adoption grows as a wrapper around ATK, there's no way today to join an ATK telemetry event back to the wiqd action that triggered it. Seeding correlation-id from an env var the parent controls closes that gap with zero new telemetry attributes on the ATK side. The env-var prefix follows the existing caller→ATK convention (ATK_CLI_SKILL), not the deprecated TEAMSFX_ brand.

Safety / backward-compat

• Env var absent (ATK run standalone, or by an older parent): setId(undefined) → falls through to uuid.v4() → byte-for-byte identical to prior behavior. The only production caller of setId is this entrypoint.
• Env var malformed / empty: rejected by uuid.validate → fresh UUID. No injection surface (value is only ever used as a correlation id).
• Correlator.run / runWithId paths are unchanged.

Safe to ship independently and in any order relative to the wiqd side.

Companion changes (cross-product correlation)

• wiqd producer (injects the id): gim-home/wiqd#1339
• wiqd un-suppress (so ATK emits in wiqd-driven runs at all): gim-home/wiqd#1332

The join key is ATK.correlation-id == wiqd.session.id. Correlation becomes visible once all three are live in the same invocation; until then every partial-deployment state degrades to "ATK mints its own id."

Testing

• packages/fx-core — vitest run tests/common/correlator.test.ts: 6/6 pass (valid id adopted; malformed → fresh; absent → fresh).
• packages/cli — vitest run tests/unit/engine.tests.ts: 46/46 pass (env var present → setId(id); absent → setId(undefined)).
• eslint + lint-staged precommit pass on both packages.

🤖 Drafted with GitHub Copilot CLI.

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