refactor(app): split Setup and ProcessOwnership modules (#628)

* refactor(domain): consolidate canonical ordering and digest helpers (#624)

* refactor(domain): consolidate canonical ordering and digest helpers

Single owner for code-point ordering (domain/canonicalOrdering.ts)
and canonical JSON digests (domain/comparisonSemantics.ts). Delete
all local compareCodePoints/compareText/digestCanonical duplicates
and migrate every importer. No re-export shims.

* fix(ci): allow slower real browser startup

* chore(config): remove dead eslint, dedupe scripts, cacheable turbo tasks

Delete eslint.config.js (oxlint is the linter), drop lint:dead alias,
pin smol-toml, fold jscpd/scan:todos into check:pr, make test:run
cacheable, align oxlint ignores.

* fix(config): hash all test inputs for cached runs

* docs: fix architecture diagram and pretty-print tool catalog

Drop dangling REPLAY edges, add dotnet/reference/error/evaluation
nodes. Emit 2-space JSON from the catalog generator and regenerate.

* test: extract shared fixtures, drop knip carve-outs

Dedupe android/apple session tests, bundler adapter headers, and
reconstruction helpers into tests/support fixtures. Delete unused
type aliases and the knip ignoreIssues block. Lower jscpd threshold
2.7 to 2.5.

* refactor(app): split Setup and ProcessOwnership modules

Extract SetupTypes/SetupHost from Setup.ts and move observation
helpers into ProcessOwnershipObservation/ProcessTree. Migrate all
importers including CLI commands. No re-export shims.

src/process/ProcessOwnershipProcessTree.ts

@@ -28,3 +28,22 @@ export const descendantsOf = (
   }
   return descendants;
 };
+
+/** Select the PTY root group and groups led by an observed captured process. */
+export const selectCapturedProcessGroupIds = (
+  rootPid: number,
+  samples: readonly {
+    readonly pid: number;
+    readonly process_group_id: number | null;
+  }[],
+): readonly number[] => {
+  const processGroupIds = new Set<number>([rootPid]);
+  for (const sample of samples) {
+    // A sampled member may transiently inherit an unrelated group. POSIX group
+    // leaders have pid === pgid, so only that observation establishes that the
+    // group leader itself belonged to the captured tree. Token checks below
+    // remain the final authority immediately before observation or signaling.
+    if (sample.pid === sample.process_group_id) processGroupIds.add(sample.pid);
+  }
+  return [...processGroupIds];
+};