fix(#2997): mask SECRET_CONFIG_KEYS in SDK config-set/get and init responses (#2999)

* fix(#2997): mask SECRET_CONFIG_KEYS in SDK config-set/get and init responses

The CJS→TS port at sdk/src/query/config-mutation.ts:240,243 and
config-query.ts:122,128,132 dropped the masking layer that secrets.cjs
spec defines for brave_search/firecrawl/exa_search. Result: the SDK
echoed plaintext API keys into machine-readable JSON output (stdout,
transcripts, CI logs).

Adjacent leak in init.ts:673-675 / init.cjs:728-730: the init bundle
passed config.brave_search through raw, leaking the API key whenever
the user had stored one.

Fix:
- New sdk/src/query/secrets.ts ports SECRET_CONFIG_KEYS, isSecretKey,
  maskSecret, maskIfSecret. Exact CJS parity (verified by 17 tests
  in secrets.test.ts that import secrets.cjs and compare).
- config-set masks value + previousValue in response; on-disk plaintext
  intact (key stays usable).
- config-get masks read response. --default flows through unmasked
  (user's own input, not stored secret).
- init.ts/init.cjs mask string values only; booleans (availability
  flags) pass through unchanged so the typed contract is preserved.

Tests: 17 in secrets.test.ts (including CJS parity), 5 in
config-mutation.test.ts (#2997 block — covers on-disk-preserved,
previousValue masking, short-value, unset, non-secret pass-through),
4 in config-query.test.ts.

Closes #2997

* chore(#2997): add changeset fragment for PR #2999

* chore(#2997): add changeset fragment for PR #2999

* chore(#2999): drop direct CHANGELOG.md edit; release entry now lives in .changeset/

The changeset-fragment workflow (#2975) renders fragments into
CHANGELOG.md at release time. Direct edits to [Unreleased] on
each PR caused merge conflicts on every concurrent PR. This commit
restores CHANGELOG.md to match origin/main; the release entry for
this fix is preserved in the .changeset/*.md fragment(s) on this
branch, which the release workflow consolidates.

sdk/src/query/init.ts

@@ -25,6 +25,7 @@ import { homedir } from 'node:os';
 
 import { loadConfig, type GSDConfig } from '../config.js';
 import { resolveModel, MODEL_PROFILES } from './config-query.js';
+import { maskIfSecret } from './secrets.js';
 import { findPhase } from './phase.js';
 import { roadmapGetPhase, getMilestoneInfo, extractCurrentMilestone, extractPhasesFromSection } from './roadmap.js';
 import { planningPaths, normalizePhaseName, toPosixPath, resolveAgentsDir, detectRuntime } from './helpers.js';
@@ -670,9 +671,14 @@ export const initPhaseOp: QueryHandler = async (args, projectDir, workstream) =>
 
   const result: Record<string, unknown> = {
     commit_docs: config.commit_docs,
-    brave_search: config.brave_search,
-    firecrawl: config.firecrawl,
-    exa_search: config.exa_search,
+    // #2997: secret config keys (brave_search, firecrawl, exa_search) may be
+    // either boolean availability flags OR string API keys depending on how the
+    // user configured them. Pass booleans through; mask string values so the
+    // init bundle never echoes plaintext credentials. Mirrors the masking added
+    // to config-get/config-set in the same fix.
+    brave_search: typeof config.brave_search === 'string' ? maskIfSecret('brave_search', config.brave_search) : config.brave_search,
+    firecrawl: typeof config.firecrawl === 'string' ? maskIfSecret('firecrawl', config.firecrawl) : config.firecrawl,
+    exa_search: typeof config.exa_search === 'string' ? maskIfSecret('exa_search', config.exa_search) : config.exa_search,
     phase_found: phaseFound,
     phase_dir: (phaseInfo?.directory as string) ?? null,
     phase_number: phaseNumber,