feat(engine): tools + agentic loop on the OpenAI wire, and two chat-breaking fixes found proving it

Teaches the OpenAI-format lane (Groq/OpenAI/Grok/Gemini/Ollama) to offer tools,
execute them, and loop — the capability that until now existed only on the
Anthropic wire. The tool-execution, consent, bridge and run-progress machinery is
reused unchanged; only the wire dialect is new.

Two pre-existing defects were found while proving it, and are fixed here because
both silently break chat:

1. PROVIDER WIRING NEVER CONNECTED. The launcher exports SOUL_LLM_PROVIDER /
   SOUL_LLM_BASE_URL and puts the provider key in ANTHROPIC_API_KEY + SOUL_API_KEY;
   the engine's provider fork read only NEURON_LLM_0_*, which nothing sets in a
   customer build. So use_openai was ALWAYS false: every non-Anthropic user's turns
   went to api.anthropic.com carrying, say, a Groq key, and came back
   "llm unavailable". Proven side-by-side against the pinned round-9 brain
   (sha256 15cf7d1b…): identical env, shipped brain = "llm unavailable" both chat
   modes with ZERO calls to the configured endpoint; this build = a real answer,
   with the probe logging POST /v1/chat/completions and Bearer <provider key>.
   Fixed brain-side only (env fallbacks) — no app or launcher change needed.

2. TRUNCATION SPLITS UTF-8 CHARACTERS. The session preload cuts recalled memory at
   fixed BYTE lengths (continuity snippet 350; session_preload_bullets per bullet).
   A cut landing inside a multi-byte character leaves a dangling lead byte in the
   SYSTEM PROMPT, making the whole request body invalid UTF-8 — providers reject it
   and the user sees an unexplained failure. Captured from a real body: 18,710 bytes,
   decode fails at 18,248 on 'e2', a box-drawing rule (U+2500 = E2 94 80) sliced in
   half. Trigger is ordinary content — em dash, curly quote, accented name, emoji,
   table border — and it gets MORE likely as memory grows. Shared code: this hit the
   Anthropic wire too. Fixed with utf8_safe_slice() applied at BOTH cut sites.

WHAT IS IN THE PORT
- llm_base_url / llm_wire_format / agentic_api_key: fall back to the launcher's own
  SOUL_LLM_* names; anthropic deliberately still returns "" so its native path is
  untouched (endpoint configurability remains neuron#62).
- openai_tools_json(): Anthropic tool schema -> OpenAI function schema; entries with
  no input_schema (Anthropic's server-side web_search) are skipped — they cannot
  execute on this wire.
- agentic_tools_no_web(): the standard set minus that server tool.
- openai_agentic_loop(): forked rather than parameterised, so agentic_loop — which
  carries every round-7/8/9 fix — is provably untouched. Same envelopes, same state
  keys, same consent policy (ask_all / escalate / builtin / always-allow), same
  client-bridge contract, same run-progress ledger, same 12-iteration cap.
- ADR-0005 mirrored on this wire: parallel_tool_calls:false is sent explicitly, and
  if a provider ignores it we honour the FIRST call and echo only that one, so the
  conversation we send is never self-contradictory. The drop is logged loudly.
- The assistant turn echoes the provider's own content bytes (json_get_raw), so a
  JSON null stays null and nothing is lost to a decode/re-encode round trip.
- Tool results are embedded already-escaped (dispatch_tool json_safe's them);
  truncation trims a dangling escape so a cut can't invalidate the body.
- bridge_save() gains a "wire" scalar and agentic_resume branches on it, so a
  suspended turn resumes on the wire it suspended on. Legacy blobs (no field) resume
  as anthropic. The field is read from the blob's SCALAR HEAD only — an unbounded
  first-match scan would run on into messages_raw, which is model-controlled, and
  that is exactly the round-9 resume defect. Pinned by a test.
- Three fork sites: handle_chat_agentic, handle_dharma_room_turn_agentic,
  agentic_resume. Tool assembly is computed once per lane at both entry points
  (it makes an HTTP call to the connector bridge; it was being paid for twice).

TOOLING THAT DID NOT EXIST
- tests/run-el-test.sh — engine tests were never runnable: elc is a compiler, it
  emits C and exits. This emits the test to C, compiles soul.c with main renamed
  away, links the rest + the repo-pinned runtime, and runs it. It also COMPUTES THE
  VERDICT, because every counted test file's "N passed, M failed" summary is a
  permanent 0/0 — the counters increment inside if BLOCKS, which El scoping
  discards (9 files; real fix filed as neuron#116). Proven to discriminate with a
  deliberately-broken assertion.
- tests/gate-openai/ — deterministic OpenAI-dialect provider stub + scenarios +
  driver + hostile modes, and a strict request validator that rejects any
  Anthropic-shaped field so dialect leakage fails loudly.

VERIFICATION (rungs named)
- E2E-VERIFIED against a LIVE provider (Anthropic's OpenAI-compatible endpoint,
  confirmed live): real answer; a tool call whose out-of-root path was DENIED by the
  guard, after which the model refused to claim success ("I won't tell you I did it,
  because I didn't"); then a valid path -> file physically on disk with exact content,
  honest reply, ledger with per-round entries + {done:true}.
- Deterministic lane gate: 11/12 in both consent configurations (bridge + local);
  hostile providers produce no hang and no fabricated answer; the 12-iteration cap
  trips with its honest message. The one FAIL is oa-tools-off and is NOT this port —
  see "Known, not fixed here".
- ANTHROPIC LANE UNCHANGED: gate9 32/32 on this build and on the pinned round-9
  brain; request bytes differ only within the noise band that two runs of the
  UNMODIFIED brain also produce (proven with a baseline-vs-baseline control), and
  the preload sections — the shared code touched here — are byte-identical.
  The rig discriminates: the round-8 brain scores 24/32 on it.
- verify-soul-contract.sh: PASS (27/27 routes, no hard-deletes).
- Unit: test_bridge_serialization 36/36 (incl. 8 new wire/field-order assertions),
  test_utf8_slice 18/18, test_agentic_tools 18 PASS / 0 FAIL / 3 documented skips.

KNOWN, NOT FIXED HERE (deliberate)
- Tools:Off on an OpenAI provider still fails: the non-agentic path goes through the
  el-runtime provider chain, which appends /v1/chat/completions to a base URL that
  already ends in /v1 -> /v1/v1/... 404. Runtime/plain-chat territory, untouched
  mid-beta. Note openai_chat_complete() has zero callers — that lane is served
  entirely by the runtime chain.
- The 12-iteration cap does not bound a chain of BRIDGED tools (iteration is
  per-invocation and resume starts fresh). Parity with the Anthropic lane.
- run_progress resets on each resume, so a client rendering cumulative steps across a
  consent pause sees earlier legs vanish. Parity with the Anthropic lane.
- verify-soul-contract.sh needs bash >= 4; under macOS's stock bash 3.2 it dies
  instantly with a FALSE red ("local: -n: invalid option").
- Groq-specific live E2E not run: no Groq key exists on this machine.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

dist/elp-c-decls.h

@@ -141,7 +141,7 @@ el_val_t awareness_run(void);
 el_val_t axon_get(el_val_t path);
 el_val_t axon_post(el_val_t path, el_val_t body);
 el_val_t bounded_persona_floor(void);
-el_val_t bridge_save(el_val_t session_id, el_val_t model, el_val_t safe_sys, el_val_t tools_json, el_val_t messages, el_val_t tools_log, el_val_t tool_use_id);
+el_val_t bridge_save(el_val_t session_id, el_val_t model, el_val_t safe_sys, el_val_t tools_json, el_val_t messages, el_val_t tools_log, el_val_t tool_use_id, el_val_t wire);
 el_val_t build_form_from_json(el_val_t semantic_form_json, el_val_t lang_code);
 el_val_t build_np(el_val_t referent, el_val_t slots);
 el_val_t build_pp(el_val_t loc);
@@ -875,6 +875,11 @@ el_val_t non_weak_past(el_val_t stem, el_val_t slot);
 el_val_t non_weak_present(el_val_t stem, el_val_t slot);
 el_val_t one_cycle(void);
 el_val_t openai_chat_complete(el_val_t model, el_val_t base_url, el_val_t api_key, el_val_t safe_sys, el_val_t messages_json);
+el_val_t openai_tools_json(el_val_t tools_anthropic);
+el_val_t json_trim_dangling_escape(el_val_t s);
+el_val_t utf8_safe_slice(el_val_t s, el_val_t n);
+el_val_t agentic_tools_no_web(void);
+el_val_t openai_agentic_loop(el_val_t session_id, el_val_t model, el_val_t safe_sys, el_val_t tools_json, el_val_t messages_in, el_val_t tools_log_in);
 el_val_t parse_float_x100(el_val_t s);
 el_val_t path_within_root(el_val_t path, el_val_t root);
 el_val_t peo_ah_past(el_val_t slot);