fix: move @mariozechner/pi-* from optional peer-deps to runtime dependencies

[NePav]

Summary

Moves @mariozechner/pi-agent-core, @mariozechner/pi-ai, and @mariozechner/pi-coding-agent from peerDependencies (with peerDependenciesMeta.optional: true) to runtime dependencies.

The plugin's bundled dist/index.js imports these unconditionally — the build script has --external:"@mariozechner/*", so they must be resolvable from the plugin's module-resolution chain at runtime. The optional: true flag is therefore not honored: when these packages aren't present, the plugin fails to load with ERR_MODULE_NOT_FOUND instead of degrading gracefully.

Treating them as runtime dependencies makes the plugin self-contained on npm install and removes the host-symlink workaround that fresh OpenClaw installs currently need.

Fixes #636.

Why this approach (vs. honoring optional via dynamic imports)

The simplest and safest fix is to make the package.json reflect what the runtime already does (hard-require these). Honoring optional: true in code would require splitting the imports into dynamic await import() calls with try/catch and feature-gating the dependent code paths — a larger change with semantic implications about which features should still work without the pi-* deps. If you'd prefer that direction instead, happy to close this PR and rework — let me know.

Trade-offs

• Pro: Self-contained npm install. No host-bundling assumption. Works on any openclaw install path or version, not just ones that ship @mariozechner/* bundled.
• Pro: Removes the now-orphan peerDependenciesMeta entries (only @mariozechner/* were listed; openclaw peer-dep stays).
• Con: ~minor disk overlap with OpenClaw's bundled copies of the same packages on installs where both are present. Bounded by >=0.66 <1 range and the existing pinned bundled version.

Verification

Locally on macOS / Node 22.22.1, after applying:

$ rm -rf node_modules/@mariozechner/  # simulate fresh install with no host-symlink
$ npm install --omit=dev
added 685 packages in 12s
$ ls node_modules/@mariozechner/
pi-agent-core  pi-ai  pi-coding-agent

After running the plugin under OpenClaw 2026.5.7:

• openclaw plugins inspect lossless-claw → Status: loaded (was: failed to load)
• Context engine slot binds correctly; sessions use lossless-claw, not legacy fallback
• No ERR_MODULE_NOT_FOUND in logs

Diff scope

• package.json: 3 entries moved (deps), 3 entries removed (peerDeps), peerDependenciesMeta removed
• package-lock.json: regenerated via npm install --omit=dev (smaller, since pi-* are no longer duplicated as devDeps)
• .changeset/move-pi-deps-to-dependencies.md: patch-level changeset describing the fix

Notes

• I dropped @mariozechner/pi-* from devDependencies since they're now installed via dependencies regardless. If you'd rather keep them pinned in devDeps for reproducible test/build (the original had them at 0.66.1 exact), happy to add back — just say the word.
• Used >=0.66 <1 for the dependency range to mirror the original peer-dep range; tightening to e.g. ^0.66.1 would also be reasonable.