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D21 from the eng review. Three new v0.36.0.0 cycle phases (propose_takes, grade_takes, calibration_profile) share enough structure that the duplication-vs-abstraction trade tips toward a shared base. Without this scaffold, source-isolation discipline would drift exactly the way it drifted in v0.34.1 — except this time across three new surfaces at once. What this enforces: 1. Phase signature is uniform: run(ctx, opts) → PhaseResult. 2. ctx.sourceId / ctx.auth.allowedSources MUST be threaded through every engine call. The base class surfaces a scope() helper that wraps sourceScopeOpts(ctx) and is the only sanctioned way to read source- scoped data. Forgetting to thread source scope becomes a TypeScript compile error, not a runtime leak. Closes the v0.34.1 leak class structurally for every new phase. 3. Budget meter wraps run() automatically. Subclass declares budgetUsdKey + budgetUsdDefault; base reads the resolved cap from config and creates the BudgetMeter. Subclass calls this.checkBudget() before each LLM submit; budget-exhausted phase still returns status='ok' (clean abort) so the cycle report shows partial completion, not failure. 4. Error envelope is uniform. Thrown errors get caught and converted to status='fail' with a phase-specific error.code via the subclass's mapErrorCode() hook. 5. Progress reporter integration. Base accepts the reporter via opts; subclasses call this.tick() instead of touching the reporter directly, so the phase name in the progress stream is always correct. Tests: 13 cases in test/core/base-phase.test.ts cover source-scope threading (5 cases including the empty-allowedSources-MUST-NOT-widen-scope regression), PhaseResult shape including the error envelope path (3 cases), dry-run propagation (2 cases), and budget meter construction (3 cases including config-key override). Synthesize.ts / patterns.ts (existing pre-v0.36 phases) deliberately do NOT retrofit to this base in v0.36.0.0 — too much churn for a refactor that doesn't pay off until v0.37+. Future phases use this by default. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>