#1180 swamp quest: deeds credit XP on command invocation, not success — failed commands still award full XP

swamp quest (new in the 20260715/20260716 builds) awards a deed's XP when the underlying command is invoked, regardless of whether the command succeeded. Commands that error out (non-zero exit / FTL error, nothing accomplished) still credit full XP, so the pass can be farmed with no-op/failing commands.

Reproduction (each step observed live)

Starting at 505 XP:

1. swamp extension pull @nonexistent-collective/does-not-exist-xyz123 → fails: Error: "Extension @nonexistent-collective/... not found in the registry." → quest XP jumps 505 → 565 (the swamp extension pull +60 deed credited, though nothing was pulled).
2. swamp model create @no/such-type-xyz quest-bug-probe → fails: Error: "Unknown model type: @no/such-type-xyz ..." (no model created) → quest XP jumps 565 → 640 (the swamp model create +75 deed credited, though no model exists).

swamp model search confirms no quest-bug-probe model was created — the deed credited for a command that provably did nothing.

Expected

A deed should credit only when its command completes successfully (exit 0 / the effect actually happened) — e.g. extension pull only when an extension was pulled, model create only when a model was created. Crediting on invocation lets any user (or a script) farm XP/tiers with garbage commands.

Environment

swamp 20260716.190954.0-sha.b479eb8a, macOS (darwin 25.2.0).