fix(tasks): switch cwd detection from removed for-cwd to view . --json

[muqsitnawaz]

Why

agi-cli deleted agents projects for-cwd and folded cwd→project detection into agents projects view <path> --json (PHNX-3704 / agi-cli #3380, merged + released). linear-cli main's resolve_cwd_project still calls the now-removed for-cwd, so on an updated agents binary it falls open to unscoped — the regression the unreleased 0.20.0 auto-scope was about to ship.

What

• resolve_cwd_project → a single agents projects view . --json call. It longest-matches the cwd over every bound root + monorepo subpath and returns {name, linear:{name, projectId}, root} in one shot (unmatched cwd → null fields, exit 0). Replaces the two-call for-cwd + list dance.
• Same fail-open contract: missing binary / timeout / nonzero / bad JSON / no match → (None, None), never raises.
• Amends the unreleased 0.20.0 CHANGELOG (latest tag is v0.19.1; no version bump).

Verified

• python3 -m unittest test_linear → 132 pass (ResolveCwdProjectTest rewritten to the single view call).
• Live against the installed agents (which already has view, lacks for-cwd):
  • from agents/prix → project: {name: Prix, auto: true}, scope all, 64 tasks
  • from /tmp → project: null, unscoped

Closes the consumer half of PHNX-3704. After merge → cut linear-cli 0.20.0.

[prix-cloud]

Code Reviewer

Verdict: Ready to merge

Build: ✅ Compiles cleanly (Python syntax check, py_compile)
Tests: ✅ 132 pass, 0 failures, 0 errors (all test_linear)

Summary

Replaces the two-call agents projects for-cwd --json + agents projects list --json dance with a single agents projects view . --json call, matching the upstream agi-cli API change (PHNX-3704 / agi-cli #3380). The new call returns the matched project's Linear binding ({name, linear: {name, projectId}, root}) in one shot.

Changes that work well

• Strictly simpler code. The _agents_json helper is removed entirely — the single subprocess call is inlined with the same fail-open error handling, saving ~9 lines of indirection.
• Same fail-open contract. Every edge case the original handled (OSError/ValueError/SubprocessError, nonzero exit, empty stdout, bad JSON, non-dict response, missing linear key) is preserved. (None, None) is returned for all of them.
• Tests updated precisely. Each of the 6 ResolveCwdProjectTest cases was rewritten to match the new single-call pattern, including the renamed test_view_without_linear_binding_is_none (was test_def_without_linear_binding_is_none).
• lin = data.get("linear") or {} is correct — handles both "linear": None (unbound cwd) and a missing key uniformly, yielding {} and then (None, None) from the subsequent .get() calls.
• CHANGELOG is amended cleanly within the unreleased 0.20.0 section (no version bump needed since latest tag is v0.19.1).

Issues

None found. The diff is a straightforward API consumer switch with complete test coverage and no observable behavior changes.

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Reviewed by Code Reviewer — actually ran the build and tests on this branch (132/132 pass).