HappyCodex v0.15.1

HappyCodex v0.15.1 bounds Root convergence on decision-changing evidence
while preserving hard-task blockers, required unknowns, and existing release
safety.

Highlights:

• Adds an explicit stability handoff covering Outcome, change boundary, Done,
  writer, blockers, increments, and exclusions.
• Gives the fixed Executor the candidate write lock and admits later revision
  briefs only with new decision-changing evidence or a concrete blocker.
• Admits new obligations through a concrete Outcome, preservation, required-
  workflow, or candidate-new safety/correctness failure path; plan-stage
  reasoning remains allowed and implementation reproduces where feasible.
• Preserves current blockers and required unknowns instead of treating the
  convergence gate as a reason to escape or close them.
• Allows Root at most one focused verification after delegated evidence,
  requires naming the verdict it could flip, and answers status/conclusion
  requests with the current verdict and unknowns first.
• Makes Root read-only after freeze and returns any candidate change to the
  fixed Executor before checks, refreeze, and existing review semantics.
• Adds no controller, mutable ledger, runtime monitor, model downgrade, token
  quota, or other runtime enforcement mechanism.

Validation:

• Full offline suite, focused convergence/version tests, manifest JSON and
  Python import validation, Skill/plugin validators, line budgets, published-
  tree immutability, commit-bound readback, and Git diff checks pass.
• Fresh no-history blocker-only Exact-final: GO.

Install:
codex plugin marketplace add cch96/happycodex
codex plugin add happycodex@happycodex

Installation and activation are separate from this release. Start a new
Codex task after any separately authorized installation or activation.