feat(scheduler-sim-decision-parity): add reconciliation trigger and lookup (task 2.2)

Adds sim_reconcile_unaccounted_jobs(xce_sched_sim_driver_t*, replay_session_t*)
to sim_loop.c -- not yet wired into the round boundary (task 3). Once per
call, finds every RUN-state job with job->accounts == NULL (the signature of
a job already resolved before this replay's own live decision-making ever
considered it) and searches this round's decoded recorded-decision stream
for a matching DISPATCH entry by jobid.

This task implements only the trigger + lookup + not-found path: when no
match exists, the job's allocation is left unknown (not fabricated), no
error is raised, and the job is safe to re-check next round (Requirement
4.1, 4.2). Match-found reconstruction (ownership transfer, freeing/
compacting the consumed entry, reporting) is tasks 2.3/2.4, not implemented
here -- decoded_session's decisions are read but not yet mutated.

6 new tests cover: not-found leaves job unaccounted, cross-round safety,
already-accounted jobs are skipped, a same-jobid PEND entry is correctly
not mistaken for a DISPATCH match, non-RUN-state jobs are gated out, and
NULL-argument safety. RED phase: compile-error-before/link-succeeds-after,
the correct RED variant for genuinely new code with no prior behavior.

46/47 scheduler tests pass; the 1 failure is pre-existing bug-1560
(unrelated).

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

.kiro/specs/scheduler-sim-decision-parity/tasks.md

@@ -27,7 +27,7 @@
   - _Depends: 1.1_
   - _Boundary: Sim Driver Round-Boundary Accounting_
 
-- [ ] 2.2 Detect and locate already-resolved jobs needing reconciliation
+- [x] 2.2 Detect and locate already-resolved jobs needing reconciliation
   - Identify, once per round, every currently-running job that has no known resource allocation yet (this is the signature of a job that was already resolved earlier in the original recording, before this replay run's own live decision-making ever considered it)
   - For each such job, search this round's decoded recorded-decision data for the matching originating decision by job identity
   - When no matching recorded decision is found, leave the job's allocation unknown, report its usage as unavailable rather than fabricating a value, and continue processing the rest of the replay without treating this as an error