fix(#2376): emit absolute subagent-facing paths from init/state, convert workflow literals (#2428)

* fix(#2376): emit absolute subagent-facing init/state paths

Make init.* and state.* path fields absolute rather than cwd-relative
so subagent prompts resolve correctly regardless of working directory.
Adds intel_dir/conflicts_path/requirements_path/roadmap_path/state_path
to cmdInitIngestDocs, an absolute debug_dir to cmdStateLoad, and
replaces bare .planning/... literals in 12 workflow Agent() prompt
blocks with the absolute init-JSON path fields. Includes decoy-cwd
regression tests and realpath'd tmpdir fixtures for macOS.

Squashed rebase of the #2376 commit series onto a fresh origin/next
(previous merge ee25543a1 was against a now-stale next).

* chore(#2376): add changeset

* chore(#2376): regenerate golden fixtures + workflow size baseline

Regenerated after rebasing the absolute-path fix onto current next
(picks up #2351's run-with-timeout content in execute-phase.md too).

* fix(#2376): trim execute-phase.md redundancy to stay under the size margin

* chore(#2376): regenerate golden/size baseline after rebase onto next

.changeset/humble-voles-glide.md

@@ -0,0 +1,5 @@
+---
+type: Fixed
+pr: 2428
+---
+**Subagent prompts embedding orchestrator-relative planning paths now resolve correctly when the spawned subagent's own working directory differs from the orchestrator's (e.g. a git worktree)** — `init.*` (and `state.load`) command handlers now emit `state_path`, `roadmap_path`, `phase_dir`, `project_path`, `research_dir`, `codebase_dir`, `intel_dir`, `conflicts_path`, `debug_dir`, and similar fields as absolute paths anchored on the project root, and the planner/checker/verifier/synthesizer/roadmapper/debugger/mapper/classifier subagent-prompt blocks that previously hardcoded bare `.planning/...` literals now reference those fields instead; a subagent spawned into a different cwd would previously report real, already-committed files as missing. (#2376)