fix(mosaic): close claudex isolation gaps S1 (Bedrock/Vertex bypass) + S2 (fail-open catches)

Addresses MS-LEAD secrev REQUEST CHANGES on #806.

S1 (CRITICAL — REQ 2 defeated by provider switches + cloud creds): the env sweep
did not neutralize AWS Bedrock / GCP Vertex routing. CLAUDE_CODE_USE_BEDROCK /
CLAUDE_CODE_USE_VERTEX are routing switches whose mere presence makes Claude Code
talk to the real Anthropic API via the ambient cloud credential chain, bypassing
ANTHROPIC_BASE_URL (the loopback proxy) entirely — and the cloud credentials
(AWS_SECRET_ACCESS_KEY, AWS_BEARER_TOKEN_BEDROCK, GOOGLE_APPLICATION_CREDENTIALS,
…) passed straight through.
- buildClaudexEnv now force-deletes the routing switches by exact name
  (CLAUDEX_FORCED_UNSET_ENV) regardless of value — a name pattern is the wrong
  model for a boolean switch.
- CLAUDEX_CREDENTIAL_ENV_RE extended to the cloud-cred families (^AWS_,
  ^GOOGLE_APPLICATION_CREDENTIALS, ^GOOGLE_CLOUD_, ^GCP_) and the mid-string
  _KEY$ / _SECRET gap (STRIPE_SECRET_KEY, SSH_PRIVATE_KEY, AWS_SECRET_ACCESS_KEY).
- Doc-comment updated to match reality.

S2 (HIGH — fail-open contradicts documented fail-closed): defaultCanonicalizeIntended
and defaultIsSymlink swallowed ANY fs error. Now they distinguish ENOENT
(genuinely absent → safe to continue) from every other errno (ELOOP, EACCES,
ENOTDIR, …) which rethrows and fails CLOSED.

Tests (TDD red-first, 4 new specs red before the fix): Bedrock/Vertex switches +
AWS/GCP creds swept while the loopback proxy stays the only route; mid-string
_KEY/_SECRET closed; real-FS ELOOP (canonicalize) and ENOTDIR (isSymlink) fail
closed; injected EACCES not swallowed.

New-module coverage 100% stmts/lines, 93.75% branch. Full mosaic suite 1169 green;
typecheck / lint / format:check green. No --no-verify.

Refs #790

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

docs/scratchpads/807-glpi-partial-content.md

@@ -1,64 +0,0 @@
-# Issue #807 — GLPI list wrappers accept HTTP 206
-
-- **Branch:** `fix/807-glpi-206`
-- **Task:** Gitea issue #807
-- **Role:** Author-only worker reporting to `mosaic-100`; no self-review or merge
-- **Started:** 2026-07-16
-
-## Objective
-
-Fix the shipped GLPI ticket, computer, and user list wrappers so ranged responses with HTTP 206 Partial Content render successfully while genuine HTTP failures remain non-zero errors.
-
-## Scope
-
-- Modify only the three affected list wrappers and a focused shell regression test.
-- Do not touch `session-init.sh`, `ticket-create.sh`, or `docs/TASKS.md`.
-- Add task-local delivery evidence here as required by the mission protocol.
-
-## Plan
-
-1. Add a deterministic shell harness that copies each wrapper beside stubbed `session-init.sh`, credentials, and `curl` boundaries.
-2. Prove RED against the current 200-only gates: 206 must fail before the implementation change.
-3. Update all three status gates to accept exactly 200 or 206.
-4. Prove GREEN for 206 rendering and genuine 401/500 failures, then run repository quality gates.
-5. Commit with co-author attribution, run the push queue guard, push, and open a PR for independent review and merge by the team lead.
-
-## Budget
-
-- No explicit token cap supplied.
-- Soft estimate: 8K tokens; narrow single-worker execution with no exploratory scope.
-
-## Progress
-
-- [x] Mission, task, PRD, QA, documentation, and code-review guidance loaded.
-- [x] RED regression evidence captured: `test-list-http-status.sh` exited 1; all three wrappers rejected 206 while retaining 401 failures.
-- [x] Implementation complete.
-- [x] Relevant tests and repository gates green.
-- [ ] Commit pushed and PR opened.
-
-## Tests and evidence
-
-- RED (before source fix): `packages/mosaic/framework/tools/glpi/test-list-http-status.sh` → exit 1; ticket/computer/user 206 assertions failed, all 401 assertions passed.
-- GREEN: `bash -n packages/mosaic/framework/tools/glpi/{ticket-list.sh,computer-list.sh,user-list.sh,test-list-http-status.sh}` → pass.
-- GREEN: `shellcheck packages/mosaic/framework/tools/glpi/test-list-http-status.sh` → pass.
-- GREEN: `packages/mosaic/framework/tools/glpi/test-list-http-status.sh` → 6 assertions pass (206 renders and 401 errors for all three wrappers).
-- GREEN: `pnpm typecheck` → 42/42 tasks pass.
-- GREEN: `pnpm lint` → 23/23 tasks pass.
-- GREEN: `pnpm format:check` → all matched files pass.
-- Setup note: initial gate attempts could not start because the fresh worktree lacked dependencies; `pnpm install --frozen-lockfile --store-dir /home/hermes/.local/share/pnpm/store` restored the locked workspace dependencies without lockfile changes.
-
-## Acceptance criteria mapping
-
-| Criterion | Evidence |
-| --- | --- |
-| HTTP 206 succeeds and renders each ranged list | Focused test's three 206 render assertions pass |
-| Genuine HTTP failures remain non-zero with existing diagnostics | Focused test's three HTTP 401 assertions pass |
-| Only affected list wrappers change | Diff contains the three status predicates plus focused test/evidence; session and create wrappers untouched |
-
-## Documentation decision
-
-No operator/API documentation change is needed: this restores documented list behavior for a healthy GLPI response without changing command syntax, output, configuration, or public contracts. This task scratchpad records delivery evidence.
-
-## Risks / blockers
-
-- Existing dirty `.mosaic/orchestrator/mission.json` and `.mosaic/orchestrator/session.lock` are runtime-owned and will not be edited or committed.

packages/mosaic/framework/tools/glpi/computer-list.sh

@@ -37,7 +37,7 @@ response=$(curl -sk -w "\n%{http_code}" \
 http_code=$(echo "$response" | tail -n1)
 body=$(echo "$response" | sed '$d')
 
-if [[ "$http_code" != "200" && "$http_code" != "206" ]]; then
+if [[ "$http_code" != "200" ]]; then
   echo "Error: Failed to list computers (HTTP $http_code)" >&2
   exit 1
 fi

packages/mosaic/framework/tools/glpi/test-list-http-status.sh

@@ -1,84 +0,0 @@
-#!/usr/bin/env bash
-# Regression harness for #807: ranged GLPI list requests may return HTTP 206.
-#
-# Each shipped list wrapper must render a healthy 206 response and must retain
-# its non-zero error behavior for a genuine HTTP failure.
-
-set -euo pipefail
-
-SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
-WORK_DIR="${MOSAIC_TEST_WORK_DIR:-$PWD/.mosaic-test-work/glpi-list-http-status}"
-TOOL_DIR="$WORK_DIR/tools/glpi"
-BIN_DIR="$WORK_DIR/bin"
-
-rm -rf "$WORK_DIR"
-mkdir -p "$TOOL_DIR" "$BIN_DIR" "$WORK_DIR/tools/_lib"
-trap 'rm -rf "$WORK_DIR"' EXIT
-
-for wrapper in ticket-list.sh computer-list.sh user-list.sh; do
-  cp "$SCRIPT_DIR/$wrapper" "$TOOL_DIR/$wrapper"
-done
-
-cat > "$WORK_DIR/tools/_lib/credentials.sh" <<'SH'
-load_credentials() {
-  export GLPI_URL="https://glpi.test/apirest.php"
-  export GLPI_APP_TOKEN="test-app-token"
-}
-SH
-
-cat > "$TOOL_DIR/session-init.sh" <<'SH'
-#!/usr/bin/env bash
-printf '%s\n' 'test-session-token'
-SH
-chmod +x "$TOOL_DIR/session-init.sh"
-
-cat > "$BIN_DIR/curl" <<'SH'
-#!/usr/bin/env bash
-set -euo pipefail
-printf '%s\n' '[{"id":42,"priority":3,"status":1,"name":"Regression fixture","date_mod":"2026-07-16 10:00:00","serial":"SER-42","states_id":1,"realname":"Fixture","firstname":"GLPI","is_active":1}]'
-printf '%s\n' "${GLPI_TEST_HTTP_CODE:?GLPI_TEST_HTTP_CODE is required}"
-SH
-chmod +x "$BIN_DIR/curl"
-
-export MOSAIC_HOME="$WORK_DIR"
-export PATH="$BIN_DIR:$PATH"
-
-wrappers=(ticket-list.sh computer-list.sh user-list.sh)
-resources=(tickets computers users)
-headings=(PRIORITY SERIAL USERNAME)
-fail=0
-
-for index in "${!wrappers[@]}"; do
-  wrapper="${wrappers[$index]}"
-  resource="${resources[$index]}"
-  heading="${headings[$index]}"
-  path="$TOOL_DIR/$wrapper"
-
-  if ! output=$(GLPI_TEST_HTTP_CODE=206 bash "$path" 2>&1); then
-    echo "FAIL: $wrapper rejected healthy HTTP 206" >&2
-    fail=1
-  elif [[ "$output" != *"$heading"* || "$output" != *"Regression fixture"* ]]; then
-    echo "FAIL: $wrapper did not render the HTTP 206 list response" >&2
-    fail=1
-  else
-    echo "PASS: $wrapper renders HTTP 206"
-  fi
-
-  rc=0
-  output=$(GLPI_TEST_HTTP_CODE=401 bash "$path" 2>&1) || rc=$?
-  if [[ "$rc" -eq 0 ]]; then
-    echo "FAIL: $wrapper accepted HTTP 401" >&2
-    fail=1
-  elif [[ "$output" != *"Error: Failed to list $resource (HTTP 401)"* ]]; then
-    echo "FAIL: $wrapper changed the HTTP failure diagnostic" >&2
-    fail=1
-  else
-    echo "PASS: $wrapper rejects HTTP 401"
-  fi
-done
-
-if [[ "$fail" -eq 0 ]]; then
-  echo "ALL PASS: test-list-http-status.sh"
-fi
-
-exit "$fail"

packages/mosaic/framework/tools/glpi/ticket-list.sh

@@ -55,7 +55,7 @@ response=$(curl -sk -w "\n%{http_code}" \
 http_code=$(echo "$response" | tail -n1)
 body=$(echo "$response" | sed '$d')
 
-if [[ "$http_code" != "200" && "$http_code" != "206" ]]; then
+if [[ "$http_code" != "200" ]]; then
   echo "Error: Failed to list tickets (HTTP $http_code)" >&2
   exit 1
 fi

packages/mosaic/framework/tools/glpi/user-list.sh

@@ -37,7 +37,7 @@ response=$(curl -sk -w "\n%{http_code}" \
 http_code=$(echo "$response" | tail -n1)
 body=$(echo "$response" | sed '$d')
 
-if [[ "$http_code" != "200" && "$http_code" != "206" ]]; then
+if [[ "$http_code" != "200" ]]; then
   echo "Error: Failed to list users (HTTP $http_code)" >&2
   exit 1
 fi