Loki Mode

Trust-core fixes surfaced by a live calibration build (RED/GREEN, council-gated)

A real bounded engine build (the shipped v7.115 artifact against a 3-item PRD)
produced a genuinely-working, fully-tested deliverable, and surfaced two real
defects that no fixture caught. Both are fixed here with RED/GREEN tests.

• TRUST DEFECT: passing tests were recorded as tests: not_run, so
  genuinely-correct, fully-tested work got a NOT VERIFIED headline (false
  negative). The test-runner detection did not recognize Node's built-in
  node --test runner (stable since Node 18, runs *.test.{js,mjs,cjs} with
  zero config and NO package.json). A deliverable of slug.js + slug.test.js
  (9/9 passing) fell through to runner:none / status:not_run / verification_gap:source_without_tests, so the proof honestly derived NOT
  VERIFIED -- a false negative that is as corrosive to a trust-as-product engine
  as fake-green. The detection lives in BOTH paths (the in-loop test gate in
  autonomy/run.sh AND the loki verify gate in autonomy/verify.sh); both are
  now fixed. A node --test branch was added as a FALLBACK below every explicit
  path (a package.json declaring vitest/jest/mocha still selects that runner):
  it fires only when node is on PATH and matching test files exist, records
  the REAL result (runner="node-test", pass from exit code, parsed counts), and
  a FAILING suite records pass:false (never swallowed). Source without test
  files still records source_without_tests (no over-fire); no node still falls
  through to the honest inconclusive path (never fabricates a pass). Test:
  tests/test-node-test-detection.sh (9/9 incl. both-paths + failing-honesty +
  jest-no-regression cases).
• BUG: double-.loki path when writing the COMPLETED / orchestrator state
  markers. autonomy/loki sets LOKI_DIR="${LOKI_DIR:-.loki}", and two sites
  in autonomy/run.sh defined loki_dir with the /.loki OUTSIDE the :-
  default ("${LOKI_DIR:-${TARGET_DIR:-.}}/.loki"), so a set LOKI_DIR of .loki
  became .loki/.loki -- the build failed with
  .loki/.loki/COMPLETED: No such file or directory. Both sites
  (_advance_current_phase + main) are corrected to the sibling form
  "${LOKI_DIR:-${TARGET_DIR:-.}/.loki}" (the /.loki inside the default), so a
  set LOKI_DIR is used as-is. Behavior when LOKI_DIR is unset is unchanged. An
  exhaustive repo-wide audit confirms these were the only two buggy sites. Test:
  tests/test-loki-dir-double-path.sh (11/11).

Both tests are wired into run-all-tests.sh + local-ci.sh. No behavior change to
any shipping command surface beyond correctly recording a Node test run and
writing the marker to the right path.