feat(workflows): build implementation tasks on Ready in spec-response

I added Phase 6 to spec-response: once the author confirms a spec is Ready, file the full implementation-task breakdown in todo.org rather than leave a Ready spec nobody can act on. The phase creates one task per implementation phase, runs a completeness pass against every acceptance criterion and principle rule, marks :solo: only where the agent can build and verify end to end, collects the rest under a Manual-testing task, and defers outward-facing publish steps until the user confirms.

This is the author-side complement to spec-review's Phase 6, which emits the drop-in task block. Review produces the block, response files the work.

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