ci: pin uv version in setup-uv to eliminate per-job manifest fetch

Unpinned, astral-sh/setup-uv resolves 'latest' by fetching
https://raw.githubusercontent.com/astral-sh/versions/.../uv.ndjson on
EVERY job. A transient failure of that fetch fails the whole job before
any test runs (2026-07-28: tests slice 5/8 died 12s in with
'##[error]fetch failed' on PR #73514). Pinning version makes setup-uv
download the binary directly — one less external hop per job across all
7 call sites (tests, lint x2, docker, e2e-desktop, lockfile-check).

.github/workflows/docker.yml

@@ -88,6 +88,11 @@ jobs:
       # ---------------------------------------------------------------------
       - name: Install uv (for docker tests)
         uses: astral-sh/setup-uv@fac544c07dec837d0ccb6301d7b5580bf5edae39 # 8.2.0
+        with:
+          # Pinned: unpinned setup-uv fetches a 'latest' manifest from
+          # raw.githubusercontent.com every job; transient fetch failures
+          # fail the job (2026-07-28 incident). Keep in sync with tests.yml.
+          version: "0.9.28"
 
       - name: Set up Python 3.11 (for docker tests)
         run: uv python install 3.11

.github/workflows/e2e-desktop.yml

@@ -52,6 +52,11 @@ jobs:
       - name: Install uv
         uses: astral-sh/setup-uv@fac544c07dec837d0ccb6301d7b5580bf5edae39 # 8.2.0
         with:
+          # Pin the uv version: unpinned, setup-uv resolves "latest" by
+          # fetching a manifest from raw.githubusercontent.com on EVERY job —
+          # a transient fetch failure fails the whole job (2026-07-28 slice-5
+          # incident). Pinned, the binary downloads directly; no manifest hop.
+          version: "0.9.28"
           enable-cache: true
           cache-dependency-glob: |
             pyproject.toml

.github/workflows/lint.yml

@@ -40,6 +40,11 @@ jobs:
 
       - name: Install uv
         uses: astral-sh/setup-uv@fac544c07dec837d0ccb6301d7b5580bf5edae39 # 8.2.0
+        with:
+          # Pinned: unpinned setup-uv fetches a 'latest' manifest from
+          # raw.githubusercontent.com every job; transient fetch failures
+          # fail the job (2026-07-28 incident). Keep in sync with tests.yml.
+          version: "0.9.28"
 
       - name: Install ruff + ty
         uses: ./.github/actions/retry
@@ -129,6 +134,11 @@ jobs:
 
       - name: Install uv
         uses: astral-sh/setup-uv@fac544c07dec837d0ccb6301d7b5580bf5edae39 # 8.2.0
+        with:
+          # Pinned: unpinned setup-uv fetches a 'latest' manifest from
+          # raw.githubusercontent.com every job; transient fetch failures
+          # fail the job (2026-07-28 incident). Keep in sync with tests.yml.
+          version: "0.9.28"
 
       - name: Install ruff
         uses: ./.github/actions/retry

.github/workflows/tests.yml

@@ -74,6 +74,11 @@ jobs:
       - name: Install uv
         uses: astral-sh/setup-uv@fac544c07dec837d0ccb6301d7b5580bf5edae39 # 8.2.0
         with:
+          # Pin the uv version: unpinned, setup-uv resolves "latest" by
+          # fetching a manifest from raw.githubusercontent.com on EVERY job —
+          # a transient fetch failure fails the whole job (2026-07-28 slice-5
+          # incident). Pinned, the binary downloads directly; no manifest hop.
+          version: "0.9.28"
           # Persist uv's download/wheel cache (~/.cache/uv) across runs.
           # Keyed on the dependency manifests, so the cache is reused until
           # pyproject.toml or uv.lock changes. `uv sync` still runs every
@@ -188,6 +193,11 @@ jobs:
       - name: Install uv
         uses: astral-sh/setup-uv@fac544c07dec837d0ccb6301d7b5580bf5edae39 # 8.2.0
         with:
+          # Pin the uv version: unpinned, setup-uv resolves "latest" by
+          # fetching a manifest from raw.githubusercontent.com on EVERY job —
+          # a transient fetch failure fails the whole job (2026-07-28 slice-5
+          # incident). Pinned, the binary downloads directly; no manifest hop.
+          version: "0.9.28"
           # Persist uv's download/wheel cache (~/.cache/uv) across runs.
           # Keyed on the dependency manifests, so the cache is reused until
           # pyproject.toml or uv.lock changes. `uv sync` still runs every

.github/workflows/uv-lockfile-check.yml

@@ -70,6 +70,11 @@ jobs:
 
       - name: Install uv
         uses: astral-sh/setup-uv@fac544c07dec837d0ccb6301d7b5580bf5edae39 # 8.2.0
+        with:
+          # Pinned: unpinned setup-uv fetches a 'latest' manifest from
+          # raw.githubusercontent.com every job; transient fetch failures
+          # fail the job (2026-07-28 incident). Keep in sync with tests.yml.
+          version: "0.9.28"
 
       # `uv lock --check` re-resolves the project from pyproject.toml and
       # compares the result to uv.lock, exiting non-zero if they disagree.