Remove dead prompt-era workflow code and compatibility paths

[jrpbuilds]

Parent

Part of #46.

Relationships

Depends on #61, #62, #63, #64 and #65.

Goal

Perform the final implementation cleanup after the v1.7 runtime and prompt architecture has proven itself, removing dead helpers, obsolete prompt-era compatibility behaviour and comments/tests that describe the old orchestration model.

Scope

Audit for code and assets made redundant by the completed #46 work, including where applicable:

• old Coordinator-only bookkeeping helpers no longer called after runtime Todo/progress integration;
• obsolete public tool wrappers or registry entries superseded by Reduce specops_progress to a runtime and diagnostic primitive #54;
• prompt fragments/includes left unused after Delete or collapse obsolete shared prompt fragments #61;
• compatibility branches that only supported model-maintained Todo/progress state;
• duplicated lifecycle/eligibility helpers superseded by Consolidate workflow legality behind one canonical derivation #50;
• old prompt-specific tests superseded by behavioural coverage;
• comments/documentation describing Coordinator responsibilities that moved into tooling;
• dead types/schema fields from the previous dispatch/progress contract.

Do not remove a helper merely because it looks related to the old architecture; prove it is unused or superseded.

Package verification

The cleanup must preserve the published package contract:

• bun run check passes;
• prompt assets required at runtime are still included in the packed package;
• compiled entrypoints still resolve prompt paths/includes correctly;
• packed smoke tests exercise the final tool registry and role loading;
• no deleted source asset is still referenced only in the packed/runtime form.

Compatibility policy

v1.7 may intentionally remove internal compatibility paths that were never public API. Public configuration/tool changes should be documented and migrated deliberately rather than disappearing accidentally during cleanup.

Acceptance criteria

• Unused prompt-era helpers/fragments/types are removed or explicitly justified.
• Duplicated lifecycle/projection logic is consolidated onto the final v1.7 paths.
• Tool registry contains only the intended final public tools.
• Comments accurately describe the new ownership boundary.
• No behavioural tests depend on obsolete Coordinator prompt mechanics.
• Full check/coverage/packed smoke suite passes.
• npm pack contents include all and only the prompt/runtime assets expected by the final architecture.
• Any public-facing compatibility change is documented for Document the v1.7 orchestration architecture #67/release notes.

Out of scope

• New v1.8 features.
• Opportunistic unrelated refactors.
• Additional prompt features not required by Project: v1.7 workflow tooling and prompt simplification #46.