Route/trigger template `{var:NAME}` placeholders now resolve against vars
applied in the SAME `pic apply` transaction, not committed-only state — so a
var and a template referencing it converge in one apply instead of two.
- config_resolver: add tx-scoped `fetch_var_candidates_tx`, sharing the SQL
tail (`VAR_CANDIDATES_TAIL`) with the pool variant so they can't drift.
- apply_service: `expand_route_templates_tx`/`expand_trigger_templates_tx`
read vars via the tx (vars are reconciled in Phase A / the app's own
reconcile, both before Phase B expansion).
- templates journey: `route_template_var_resolves_in_same_apply` — would fail
against the old committed-only read.
- doc §4.5: strike the `{var:NAME}` committed-only limitation.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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