docs(changelog): v1.0.5-rc3 — #1036 unblock + mech fidelity + scorer timeout-guard

[100yenadmin]

Checkpoint marking the test-proven work since rc2: #1036 (authored-campaign measurement unblocked — #1037), mech fidelity (Champion crit + War Caster — #1038), and the scorer timeout-guard (#1039). Still NOT a GA — the GLM re-measure under the current ruler is deferred (the Angry-DM scorer hangs on combat-sprint transcripts, #1040; deterministic engine tests are the proof). Docs-only; tag follows on merge.

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• CHANGELOG.md

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