AI-Native: keep autonomous development continuous across milestones

[wpessential]

Closes #1328

Implements the owner-requested AI-Native execution cadence without broadening privilege.

• removes the one-user-turn/one-milestone stop boundary;
• checkpoints milestones but continuously selects the next safe authorized lane;
• parks WAITING_EXTERNAL / authorization-gated / dependency-gated lanes instead of idling the workspace;
• prevents repeated confirmation prompts for ordinary reversible fixes, errors, module selection and continuation;
• suppresses numbered next-action prompts while autonomous development is active;
• keeps production/destructive/provider/legal/credential/deploy/release boundaries fail-closed;
• records active consent cadence and compact state;
• updates README Current AI-Native Development Progress with a visible 100% governance progress bar;
• updates the timeout-resilient governance smoke contract so CI enforces the new continuous-execution state fields.

Cross-policy self-audit also removed the same stop-loop semantics from:

• Engineering Execution Governance;
• Runner Benchmark execution policy;
• Portable Timeout-Resilient AI Flow Prompt.

Governance/coordination policy, compact state, README live truth, and governance-only contract testing only. No product runtime, package, dependency, migration, provider, deployment or release mutation.

2026-10-08 reconciliation

• Rebases logically onto merged docs(ai): continuous autonomous execution and README progress discipline #1330 through a non-destructive two-parent merge commit; preserves its autonomy wording rather than overwriting it.
• Resolves stale coordination queue: completes RB-0096, replaces outdated Dashboard Widgets: bounded Forms/Workflow action ability reference V1 #1262 next action and adds OPEN dependency-gated RB-0097 / Dashboard Widgets: Multisite preset policy foundation V1 #1327 slot.
• Clarifies parked CI/authorization lanes in the README closeout policy so another independent safe task can proceed without user confirmation.
• All changes remain subject to exact-head Governance, Architecture and applicable compatibility checks; no security/approval bypass.