test: strengthen new session input contracts

[zatevakhin]

Scope

• Includes 69d621f0f64bf83c1f19513e41bc7a34fe0ba042 (test: strengthen new session input contracts) and fixture correction 73fd73f8f225935d9e7f6a890b0f7ae56450aca3 (test: make new session fixture collision-safe).
• Changes only test bodies in src/features/sessions/input/new_session.rs, src/runtime/mod.rs, and src/handlers.rs (+356/-48).
• Adds three tests overall, moving the complete suite from 1,170 to 1,173 tests.

Contracts

• Keeps four owner-local tests covering all six NewSessionInputResult variants: Edited, MovedCompletion, AcceptCompletion, Submit, Cancel, and NotHandled.
• Keeps root adapter/orchestration coverage for completion refresh, movement and unsupported-key no-ops, cancellation, connected/disconnected submission, launch-CWD and path normalization, profile propagation, completion acceptance, and global routing.
• Corrects the test fixture to use exclusive create_dir, retry only AlreadyExists, and clean up only a directory it successfully created. This resolves the initial independent fixture-collision ownership finding in a separate commit.

Validation

• cargo fmt --all -- --check
• cargo check --all-targets --all-features
• cargo clippy --all-targets --all-features -- -D warnings
• cargo build --all-targets --all-features
• All-feature debug and release suites twice each: 1,173 passed per run
• Default suite: 1,173 passed
• Focused owner 4, runtime popup 32 twice, handlers 49, application 62, and runtime 200
• Filesystem-backed Edited test: five consecutive passes
• git diff --check and exact scope/protected-path audits

The corrected range received independent Linus approval with no findings. It changes no production behavior, API, handler, persistence/filesystem behavior, test seam, manifest, or roadmap file. The next Delegate popup test-ownership slice is excluded and has not started. Live ACP/backend and interactive terminal smoke were unavailable and are not claimed.

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