chore(release): prepare v0.1.6-canary.1

[dev-pi2pie]

Summary

Prepare v0.1.6-canary.1 as a maintenance and packaging canary release.

This PR does not introduce a major new user-facing feature. It focuses on release hygiene, smaller published output, and toolchain/security cleanup before deciding on any further enhancements.

Changes

• remove sourcemaps from the tsdown build to reduce bundle/package size
• bump package version to 0.1.6-canary.1
• update dev tooling:
  • oxfmt to 0.43.0
  • oxlint to 1.58.0
  • tsdown to 0.21.7
• pin picomatch to 4.0.4 via overrides to resolve the transitive audit finding in the build toolchain
• archive historical pre-v0.1.0 top-level plans and research docs, with links rewritten to the new archive paths
• run formatting cleanup

Why

• reduce published artifact size
• keep the toolchain current
• clear the current dependency audit issue
• keep docs/history organized without changing active job-record storage
• publish a small canary while leaving room for later enhancement work

Verification

• bun audit
• bun run lint
• bun run format:check
• bun run test:ci
• bun run verify:package-contents

Notes

• this is intended as a canary maintenance release
• larger feature or UX enhancements can be evaluated in follow-up PRs
• doc archiving is internal maintenance and should not change runtime behavior