fix(cli)!: one typed tool-result shape for every --json refusal

[ScriptedAlchemy]

Fixes #2672

Cause

After #2651, tracedecay tool --json refusals still came out in three shapes, depending on which path produced them:

• A compatibility tool (search) printed the MCP tool result. This was already correct.
• A typed application tool (callers) went through print_cli_application_surface, whose --json branch printed json_line(&result.result): the application envelope with a top-level problem, and no isError.
• Some refusals settle before any owner answers them: a missing daemon socket, a rejected argument, an unknown tool. For these, run() printed {"problem": project_route_problem(..)}, the JSON-RPC error-data shape (reason_code/retryable/detail), which is not a problem record. The daemon-down error had no typed detail at all; its socket and service-unit facts existed only inside a sentence.

Change

• One refusing tool-result renderer, problem_tool_result (tracedecay-mcp): isError, with the typed record at structuredContent.problem. render_application_result uses it. A typed-path --json refusal now prints that tool result, marked isError just as on the compatibility path.
• A refusal that settles before any owner answers goes through render_settled_route_refusal. The error is mapped to a problem by the owner's own mapping (graph_tool_error_problem). The envelope uses the tool's CLI result contract (settled_tool_refusal, which replaces the MCP-only mcp_project_open_reset_refusal); a tool name no binding owns uses the adapter problem contract (tracedecay_api::adapter_problem). The untyped {"problem": ...} printer is deleted, and project_route_problem is now private to the JSON-RPC error-data path.
• New typed detail ApplicationProblemDetailV1::DaemonUnreachable, code daemon.unreachable, with fields socket, named_by, and service_unit (not_installed | unobservable{error} | installed{path, serves}). It maps to unavailable, retry: after_delay, legal_actions: [retry]. unreachable_daemon_detail replaces unavailable_daemon_socket_message. The rendered message and stderr keep the same sentence.
• The contracts and SDK were regenerated (contracts:generate, no drift after the rebase), and @tracedecay/sdk goes 0.9.0 → 0.10.0.

Still open, and outside this issue's scope: a successful typed-path --json call still prints the application envelope, while a compatibility tool prints the MCP tool result.

Fails on master

core_cli_suite tool_cursor_test::every_json_refusal_prints_one_typed_problem_placement runs search with an invalid cursor, callers with an unknown node id, and status against a missing TRACEDECAY_DAEMON_SOCKET. It asserts that all three have the same placement and carry the literal typed records. On master (with only this test added) it fails with:

left: [{is_error: true, members: [content, isError, structuredContent], structured_members: [problem]},
       {is_error: null, members: [contract, problem, request_id], structured_members: null},
       {is_error: null, members: [problem], structured_members: null}]

With the change it passes. The records are (invalid_request, cursor.invalid, never), (not_found_or_not_authorized, not_found_or_not_authorized, never), and (unavailable, daemon.unreachable, after_delay), with detail {"kind":"daemon_unreachable","socket":"<path>","named_by":"TRACEDECAY_DAEMON_SOCKET","service_unit":{"state":"not_installed"}} and legal_actions: ["retry"], and exit code 69.

Runtime journey

Debug tracedecay from this branch, an isolated HOME, and one daemon in a MemoryMax=6G scope:

search: keys=['content', 'isError', 'structuredContent'] isError=True top-level problem=None kind=invalid_request code=cursor.invalid retry=never legal=['correct_request', 'restart_without_cursor'] detail=null
callers: keys=['content', 'isError', 'structuredContent'] isError=True top-level problem=None kind=not_found_or_not_authorized code=not_found_or_not_authorized retry=never legal=[] detail=null
down: keys=['content', 'isError', 'structuredContent'] isError=True top-level problem=None kind=unavailable code=daemon.unreachable retry=after_delay legal=['retry'] detail={"kind": "daemon_unreachable", "named_by": "TRACEDECAY_DAEMON_SOCKET", "service_unit": {"state": "not_installed"}, "socket": "/fast/tmp/fleet-one-tool-json-shape/journey.3vLE/does-not-exist.sock"}
down exit=69; stderr: Daemon unreachable: TraceDecay daemon socket '/fast/tmp/fleet-one-tool-json-shape/journey.3vLE/does-not-exist.sock' named by TRACEDECAY_DAEMON_SOCKET is not available. No managed TraceDecay daemon service is installed. Run `tracedecay daemon install-service` only if you want a managed daemon.

(search --cursor not-a-cursor --json exit 1, callers --node-id no-such-node --json exit 1, TRACEDECAY_DAEMON_SOCKET=<missing> status --json exit 69.)

Local verification (after the rebase)

• core_cli_suite: 170/170 passed (tracedecay-cli bins 350). A re-run of tool_cursor/tool_surface_transport/tool_daemon after the final rebase passed 64/64.
• mcp_suite: 611/611 passed.
• daemon_suite code_index_park 1, runtime_acceptance (reachability, advisory, tool_client_transport) 22, transport_acceptance typed_terminal_restart_acceptance 10: all passed.
• Library tests: contracts 431, daemon-control 100, daemon-service 322, domain 224, tracedecay-mcp 388, tracedecay-api 53, focused tracedecay lib (application_surface, project_open_handshake, http_application, socket, core_client) 66, tracedecay-application 482 + application_suite 66 + pr_tracking 7. All passed.
• Clippy -D warnings on every touched crate is clean. cargo fmt --check is clean. The Windows cross-check (cargo check --workspace --all-targets --target x86_64-pc-windows-gnu ...) exits 0.
• Dashboard typecheck is clean. pnpm test: 2016/2017, with one codegen fixture test timing out at a load average near 100; it passed 15/15 when run alone. contracts:generate shows no drift. SDK typecheck and test (33) pass.

BREAKING CHANGE: tracedecay tool --json refusals from typed application tools and from pre-owner failures print the MCP tool result with the record at structuredContent.problem instead of an application envelope or an untyped {"problem": ...} object. The problem detail union gains daemon_unreachable, and @tracedecay/sdk is 0.10.0.

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