fix(goal): make execution continuous by default

Problem:
Goal mode could pause at host-owned numeric ceilings even while useful work was still progressing.

Root cause:
Default round, turn, wall-time, and stall thresholds were wired as terminal runtime boundaries and persisted as blocked Goal state.

Fix:
Remove host-owned Goal execution ceilings, preserve only user-selected resource limits, convert numeric stall guards into replanning redirects, migrate legacy numeric pauses, and expose cumulative work duration as observational runtime data.

Verification:
- go test ./...
- go test -race ./internal/agent ./internal/control
- go vet ./...
- cd desktop && go test ./...
- cd desktop/frontend && pnpm typecheck && pnpm test:all && pnpm build
- scripts/cache-guard.sh
- scripts/check-cache-impact.sh
- go run ./tools/repolint

docs/CLI.md

@@ -434,10 +434,10 @@ the displayed list matches the commands the TUI accepts.
 | `/output-style` | Select an answer style. |
 | `/verbose` | Toggle expanded reasoning display. |
 | `/sandbox` | Inspect sandbox status. |
-| `/goal [objective]` | Start a long-running goal, or inspect the current goal and its budget runtime. |
-| `/goal status` | Show the active goal plus outer turns, observational tokens/requests/no-progress, extensions, and the last continuation/evaluator reason. |
-| `/goal pause` | Pause the running goal (keeps todos, Delivery checkpoint, and budget). |
-| `/goal resume` | Resume a paused or blocked goal (budget pauses add one more budget slice). |
+| `/goal [objective]` | Start a continuous goal, or inspect its runtime statistics. |
+| `/goal status` | Show the active goal plus turns, requests, tokens, work time, and the last continuation/evaluator reason. |
+| `/goal pause` | Pause the running goal (keeps todos, Delivery checkpoint, and runtime history). |
+| `/goal resume` | Resume a manually paused or genuinely blocked goal without changing a numeric quota. |
 | `/goal clear` | End goal mode permanently. |
 | `/docs [question]` | Show the embedded corpus identity, or search it locally and ask the configured AI to answer from version-matched evidence. |
 | `/reasonix:docs [question]` | Preferred built-in fallback when an existing custom command or compatible plugin/skill alias owns `/docs`; if this spelling is also owned, the menu selects the next free `reasonix:`-qualified name without displacing it. |