docs: correct deck deploy install path

[m4ttheweric]

Follow-up housekeeping to #7.

The manifest-first plan and spec described deck's deploy installing over ~/.local/bin/deck, but deck's launchd plist runs the binary from ~/.mattstack/deck/bin/deck (install.sh's BIN_DIR). The shipped scripts/deploy.ts was already corrected during review to install there (atomic temp + mv); this brings the two docs in line so the stale path can't be copied out of them later.

Docs-only, no code change.

🤖 Generated with Claude Code

Summary by CodeRabbit

• Documentation
  • Updated deployment guidance to install the deck executable at the location used by its launch configuration.
  • Deployment instructions now include creating the destination directory and safely replacing the executable.
  • Updated self-deployment examples to reflect the standardized installation path.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

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📥 Commits

Reviewing files that changed from the base of the PR and between 195d9a2 and c22694b.

📒 Files selected for processing (2)

• docs/superpowers/plans/2026-08-28-deck-manifest-first.md
• docs/superpowers/specs/2026-08-28-deck-manifest-first-design.md

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📝 Walkthrough

Walkthrough

The deployment plan and design specification now install deck at ~/.mattstack/deck/bin/deck. The plan also documents directory creation and atomic replacement through a same-directory temporary file and rename.

Changes

Deck deployment

Layer / File(s)	Summary
Deployment path and installation procedure docs/superpowers/plans/2026-08-28-deck-manifest-first.md, docs/superpowers/specs/2026-08-28-deck-manifest-first-design.md	The deployment destination now matches the launchd-registered path. The plan creates the target directory, installs an executable temporary sibling, and atomically renames it into place. The specification retains the restart and board re-polling steps.

Estimated code review effort: 1 (Trivial) | ~5 minutes

Merge Risk:⚪ Minimal · up to c2269

This documentation-only change aligns the documented deploy path with the intended installation location; no actionable merge-blocking risk remains beyond normal checks and review.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the documentation change to the deck deployment install path.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

Full details: Docstring Coverage

Explanation

No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0 files. (2 skipped: 2 unsupported.)

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/deploy-path-doc

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