* chore(#2932): emit a per-invocation section manifest from init Extends the init bundle with a typed per-invocation section manifest so an invocation loads only the branch guidance it will actually take. The three flag/state-gated branches in execute-phase.md move into their own step files; the parent keeps its gsd:section markers wrapping a one-line on-demand reference, so each section's prose lives in exactly one file and the parent shrinks 93369 -> 89507 bytes. A new drift-guarded generator derives the shipped section manifest from those markers, and a new pure evaluator maps invocation facts to applicable section ids. The evaluator is a lookup over the frozen WHEN_VOCABULARY, never a parser (Greenspun's Tenth Rule, ADR-1671:69); a parity test asserts the vocabulary and the predicate map stay exhaustively in sync. Closes #2932 * fix(#2932): fail closed on prototype-chain when values An isolated adversarial review found WHEN_PREDICATES[section.when] was a bracket lookup on a plain-prototype object, so inherited Object.prototype members resolved as predicates: "constructor"/"toString"/"valueOf"/ "hasOwnProperty" returned truthy and SILENTLY INCLUDED the section, and "__proto__" threw an untyped TypeError carrying no .reason. Both violate the module's documented fail-closed contract, and the manifest is read from disk at run time so it cannot be assumed trustworthy. Builds the predicate map on a null prototype and guards the lookup with an explicit Object.hasOwn check. Adds table-driven coverage for nine Object.prototype-shaped keys asserting the TYPED reason (asserting only that it throws would still pass while broken) plus a fast-check property injecting a hostile value at an arbitrary document position. * test(#2932): retarget execute-phase step assertions at extracted step files * fix(#2932): emit typed reasons for generator lib-load and write failures * fix(#2932): restore launcher preamble in extracted steps and refresh derived fixtures * chore(#2932): backfill changeset pr number to 2987 --------- Co-authored-by: sim <sim@local>
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