fix(pulse): declare runtime deps + show error state when /api/wiki fails

[atabisz]

Problem

A fresh PAI 5.0.0 install hits two compounding defects when loading the Pulse /docs page:

1. Undeclared runtime dependencies. Pulse's daemon imports minisearch (in modules/wiki.ts) and smol-toml (in pulse.ts, lib.ts, and others — to parse PULSE.toml), but neither is declared as a dependency anywhere in the release. pulse.log shows ResolveMessage: Cannot find package 'minisearch' and pulse.ts swallows the error, so /api/wiki/* falls through to Pulse's 404 handler. smol-toml would crash startup outright.
2. Missing error branch in the React UI. docs/page.tsx destructures only data from useQuery. When the fetch errors, data is undefined — indistinguishable from the pending state — so the component falls through to the Loading... branch forever. The user sees an infinite spinner with no error and no console hint.

Either fix alone would mask the other.

Changes

1. Declare Pulse runtime dependencies

• New Releases/v5.0.0/.claude/PAI/PULSE/package.json declaring minisearch ^7.2.0 and smol-toml ^1.6.1.
• Co-located with pulse.ts so deps live next to the daemon that uses them.
• Bun resolves dependencies upward, so bun install in PAI/PULSE/ is sufficient.

Scope note: the daemon also has optional imports for grammy, jose, and @anthropic-ai/claude-agent-sdk (used by the telegram, github-work, and imessage modules respectively, all wrapped in try/catch). These are deliberately not declared in this PR — they need an optionalDependencies vs. plain dependencies design decision and belong in a follow-up. grammy already shows up in pulse.log as a missing-package warning today; this PR doesn't change that.

Installer follow-up needed: the installer (install.sh / PAI-Install/engine/actions.ts) doesn't currently run bun install in PAI/PULSE/. That's a separate PR — declaring the deps is the prerequisite.

2. Surface fetch errors in the React UI

• New WikiErrorState component — title, message, optional hint, retry button.
• Both useQuery hooks now propagate isError, error, and refetch to the UI.
• Error messages include the HTTP status code so the user sees HTTP 404 instead of a generic string.
• No change to the success path.

Verification

• Reproduced original bug locally: stopped the wiki module, /api/wiki → 404, /docs stuck on Loading... forever.
• Applied error-UI patch: /docs now renders "Couldn't load the wiki — Failed to fetch wiki index (HTTP 404)" with a hint pointing to pulse.log and a Retry button.
• Installed minisearch (mirroring what the new package.json declares), restarted Pulse: wiki module loads, /api/wiki/search returns 200, /docs renders normally.
• Verified smol-toml is imported by 4 daemon files (pulse.ts, lib.ts, pulse-unified.ts, checks/github-work.ts) — load-bearing for PULSE.toml parsing.

Notes

• Pre-existing Cannot find module 'react' TypeScript diagnostics in this directory are unrelated — Releases/v5.0.0/ ships without node_modules. Not introduced here.