feat(cli): polish self-update progress

[benvinegar]

Summary

• render hunk update as a compact Clack-guided flow in interactive terminals
• animate the package-manager step while keeping its noisy output out of the transient display
• preserve the existing stable plain-text contract for pipes, CI, NO_COLOR, and TERM=dumb
• show captured installer output when an update fails

Preview

┌  Hunk update
│
●  Current  0.20.1
│
●  Target   0.21.0
│
◇  Updated to 0.21.0
│
└  Done

During installation, the status line animates in place as ◒ ◐ ◓ ◑ Updating with npm.

Validation

• bun run typecheck
• bun run lint
• bun run deps:check
• bun test src/core/install/selfUpdate.test.ts
• bun run test — 2,136 passed, 3 skipped
• bunx oxfmt --check src/core/install/selfUpdate.ts src/core/install/selfUpdate.test.ts src/main.tsx package.json .changeset/cool-hunk-update.md
• git diff --check

Tested on Linux. Windows and macOS were not manually tested; the existing cross-platform command-selection coverage remains green.

This PR description was generated by Pi using gpt-5.6-sol

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1 Skipped Deployment

Project	Deployment	Actions	Updated (UTC)
hunk-web	Ignored	Preview	Aug 31, 2026 12:54pm

[greptile-apps]

Greptile Summary

This PR adds a compact Clack-based presentation for interactive hunk update runs, captures installer output while the spinner is active, and preserves the existing plain path for most non-interactive environments.

• Adds @clack/prompts and wires stdout terminal information through the CLI entry point.
• Captures and replays package-manager output on interactive failures.
• Adds tests for interactive success and truthy NO_COLOR fallback.

Confidence Score: 4/5

The plain-output predicate should be fixed before merging because documented color-disabled and CI invocations can receive animated terminal output.

The new renderer is selected for an empty NO_COLOR value and for CI jobs using a pseudo-terminal, despite the release contract requiring stable plain text in both cases.

Files Needing Attention: src/core/install/selfUpdate.ts, src/core/install/selfUpdate.test.ts

Important Files Changed

Filename	Overview
src/core/install/selfUpdate.ts	Adds interactive progress and captured child output, but its mode predicate fails to preserve plain output for empty NO_COLOR and pseudo-TTY CI environments.
src/core/install/selfUpdate.test.ts	Covers interactive success and NO_COLOR="1", but does not exercise the two plain-output conditions missed by the predicate.
src/main.tsx	Correctly supplies stdout and its TTY state to the self-update command, making the new presentation reachable from production.
package.json	Adds the exact-pinned Clack dependency used by the new update presentation.

Prompt To Fix All With AI

### Issue 1
src/core/install/selfUpdate.ts:358
**Plain-output gating ignores environment**

When `NO_COLOR` is present with an empty value, this truthiness check still enables the Clack renderer. If a CI job allocates a pseudo-terminal, the missing CI guard does the same, causing animated terminal control output to replace the documented stable plain-text output in captured logs.

---

For each issue above, determine whether it is valid and should be fixed. If so, fix it directly.

_{Reviews (1): Last reviewed commit: "feat(cli): polish self-update progress" | Re-trigger Greptile}

[greptile-apps]

Plain-output gating ignores environment

When NO_COLOR is present with an empty value, this truthiness check still enables the Clack renderer. If a CI job allocates a pseudo-terminal, the missing CI guard does the same, causing animated terminal control output to replace the documented stable plain-text output in captured logs.

Knowledge Base Used: Application runtime and startup

Prompt To Fix With AI

This is a comment left during a code review.
Path: src/core/install/selfUpdate.ts
Line: 358

Comment:
**Plain-output gating ignores environment**

When `NO_COLOR` is present with an empty value, this truthiness check still enables the Clack renderer. If a CI job allocates a pseudo-terminal, the missing CI guard does the same, causing animated terminal control output to replace the documented stable plain-text output in captured logs.

**Knowledge Base Used:** [Application runtime and startup](https://app.greptile.com/modem/-/custom-context/knowledge-base/modem-dev/hunk/-/docs/application-runtime.md)

---

For each issue above, determine whether it is valid and should be fixed. If so, fix it directly.

[benvinegar]

Fixed in 87799705. Interactive rendering now requires that neither CI nor NO_COLOR is present, including empty values, and regression coverage exercises both cases. I also hardened Clack cancellation so SIGINT/SIGTERM terminate the full installer process tree and return the corresponding shell status instead of allowing an update to continue.

_{Responded by Pi using gpt-5.6-sol.}

This comment was generated by Pi using gpt-5.6-sol