deps: everything to latest stable

Python 3.12 -> 3.14, postgres 16 -> 18, uv 0.5.11 -> 0.11.29,
trivy 0.58.1 -> 0.72.0, gitleaks 8.21.2 -> 8.30.1, yq 4.44.6 -> 4.53.3,
and every action re-pinned to the SHA of its latest tag (checkout v7,
setup-uv v8, buildx v4, login v4, hadolint v3.3.0). helm stays 3.21.3:
already current for 3.x, and helm 4 is a breaking change, not a CVE fix.

trivy mattered most. A vulnerability scanner fourteen minor versions behind is
the one stale pin that hides all the others.

ruff target-version is deliberately py313 while the runtime is 3.14. It
controls the syntax the formatter may emit, and at py314 it rewrites
'except (A, B):' into PEP 758's unparenthesized form — which reads exactly
like Python 2's 'except E, name:' and is a hard SyntaxError below 3.14. No
semantic gain, real readability cost, in a repo meant to be read.

Verified on 3.14: ruff, ruff format, mypy --strict, 166 tests, helm lint,
bandit, pip-audit. The digest guard still rejects placeholder digests.

Risk carried knowingly: the bumped actions run on node24. If act_runner only
provides node20, every job fails at action startup and this commit is the
revert.

services/reconciler/Dockerfile

@@ -7,9 +7,9 @@
 # writes: the four checks enqueue tasks, they do not provision. Orphans are logged, never
 # deleted.
 
-FROM python:3.12-slim@sha256:57cd7c3a7a273101a6485ba99423ee568157882804b1124b4dd04266317710de AS builder
+FROM python:3.14-slim@sha256:cea0e6040540fb2b965b6e7fb5ffa00871e632eef63719f0ea54bca189ce14a6 AS builder
 
-COPY --from=ghcr.io/astral-sh/uv:0.5.11@sha256:0ac957607303916420297a4c9c213bb33fbd3c888f9cd7f4f7273596ebf42b85 /uv /usr/local/bin/uv
+COPY --from=ghcr.io/astral-sh/uv:0.11.29@sha256:eb2843a1e56fd9e30c7276ce1a52cba86e64c7b385f5e3279a0e08e02dd058fc /uv /usr/local/bin/uv
 
 ENV UV_COMPILE_BYTECODE=1 UV_LINK_MODE=copy UV_PYTHON_DOWNLOADS=never
 WORKDIR /app
@@ -30,7 +30,7 @@ p = svcforge_core.__file__; \
 sys.exit(0) if "site-packages" in p else sys.exit("not a wheel install: " + p)'
 
 # --- runtime --------------------------------------------------------------------------
-FROM python:3.12-slim@sha256:57cd7c3a7a273101a6485ba99423ee568157882804b1124b4dd04266317710de
+FROM python:3.14-slim@sha256:cea0e6040540fb2b965b6e7fb5ffa00871e632eef63719f0ea54bca189ce14a6
 
 ARG BUILD_SHA=unknown
 LABEL org.opencontainers.image.title="svcforge-reconciler" \