feat: E2E #2 (Stash) gap remediation + S6 hardening

Closes the gaps and the one security finding from the second end-to-end
CLI test (E2E_STASH_REPORT.md), plus the H1 boot-regression found while
re-reviewing those fixes.

Security
- S6: reserved-path validation (`check_reserved`) now case-folds before
  comparing, so `/API/v2/x`, `/HEALTHZ`, `/Admin/x` are rejected like
  their lowercase forms. Request-time matching stays case-sensitive.
- S10: "public route != public data" callout in sdk-shape.md (script_gate
  skips authz when the principal is anonymous).

Observability / features
- G1: trigger executions now write `execution_logs`. Migration 0043 adds
  a `source` column (CHECK mirrors ExecutionSource/OutboxSourceKind,
  DEFAULT 'http' backfills history); a shared `build_execution_log` helper
  in executor-core; dispatcher logging for outbox triggers + queue
  consumers (skips sync-HTTP rows the orchestrator already logs). `pic
  logs` gains a source column + `--source` filter.
- G5: dev-only in-memory email capture under PICLOUD_DEV_MODE with no SMTP
  (email::send succeeds locally), readable at GET /api/v1/admin/dev/emails
  (Owner/Admin only; route mounted only in capture mode).
- G6: generalized the Rhai in-place-mutation footgun note (trim/replace/
  make_upper/make_lower/crop/truncate/pad return ()).
- G2/G3/G4 (CLI): `pic members`, `pic files`, `pic queues`, read-only
  `pic kv` (+ new kv_api.rs); `pic deploy --timeout/--memory/--kind/
  --sandbox`; first-class `pic triggers create-{docs,files,pubsub,queue,
  email}` wrappers. All new client path segments percent-encoded via seg().

H1 regression fix (found in re-review)
- The S6 change also runs in `compile_routes`, which compiles every stored
  route at boot and on each route CRUD. A single stored route the new
  validation rejects (creatable while the S6 gap existed) made the whole
  compile Err and aborted startup. `compile_routes` is now lenient: it
  skips an un-compilable row with a warning instead of bricking boot
  (route creation still validates separately). Migration 0044 sweeps
  pre-existing reserved-path routes on upgrade (WHERE mirrors
  check_reserved exactly). Added regression tests for both.

Verified: cargo fmt, clippy --all-targets --all-features -D warnings, the
schema_snapshot test, and the new S6/lenient-compile unit tests all pass;
boot-resilience and G1/G5 confirmed live.

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

crates/manager-core/tests/expected_schema.txt

@@ -194,6 +194,7 @@ table: execution_logs
   status: text NOT NULL
   created_at: timestamp with time zone NOT NULL default=now()
   app_id: uuid NOT NULL
+  source: text NOT NULL default='http'::text
 
 table: files
   app_id: uuid NOT NULL
@@ -590,6 +591,7 @@ constraints on email_trigger_details:
   [PRIMARY KEY] email_trigger_details_pkey: PRIMARY KEY (trigger_id)
 
 constraints on execution_logs:
+  [CHECK] execution_logs_source_check: CHECK ((source = ANY (ARRAY['http'::text, 'kv'::text, 'docs'::text, 'dead_letter'::text, 'cron'::text, 'files'::text, 'pubsub'::text, 'email'::text, 'invoke'::text, 'queue'::text])))
   [CHECK] execution_logs_status_check: CHECK ((status = ANY (ARRAY['success'::text, 'error'::text, 'timeout'::text, 'budget_exceeded'::text])))
   [FOREIGN KEY] execution_logs_app_id_fk: FOREIGN KEY (app_id) REFERENCES apps(id) ON DELETE CASCADE
   [FOREIGN KEY] execution_logs_script_id_fkey: FOREIGN KEY (script_id) REFERENCES scripts(id) ON DELETE SET NULL
@@ -711,3 +713,5 @@ constraints on triggers:
   0040: execution logs keep history
   0041: dead letters composite idx
   0042: secrets envelope version
+  0043: execution logs source
+  0044: delete reserved path routes