feat(dev-preview): 10-minute offline quickstart + resume demo

[Davincc77]

Summary

Adds a developer preview path so an external developer can see what x.klickd structured memory/skill context does in under 10 minutes, with no API key, no account, and no secrets. Scope is intentionally reduced to Python CLI + one demo, per the Day 2 brief.

• Root editable install. New root pyproject.toml makes pip install -e . work from a fresh clone, installing the same published klickd package whose source lives at packages/pypi/klickd/ (no code duplication, version stays 4.1.0).
• Smoke test — examples/dev-preview/hello_skill.py: loads a bundled starter skill and one of the 42 v4.1 candidate packs, hash-verified against the published manifest. No LLM.
• Comparative demo — examples/dev-preview/run_demo.py: deterministic, offline simulation of an agent resuming an interrupted coding task two ways — bare prompt vs. carried memory + skill gates. The human-veto/verification-gate rules the x.klickd lane obeys are read live from the bundled x.klickd/coding skill (not hardcoded), and the script emits results/comparison_scorecard.md.
• Public-safe README — examples/dev-preview/README.md: what it proves, what it does not prove (not a model benchmark, not native client support, no compliance claim), and how it relates to the internal supply chain without exposing any private detail.
• Tests — tests/test_dev_preview.py: asserts both scripts run clean, the scorecard is generated, the two lanes genuinely diverge, the scorecard governance matches the real skill, and no forbidden release/benchmark phrasing leaks in.
• Docs — docs/getting-started.md: new 2c dev-preview section.

Truth boundary (no mirage)

• Public release remains v4.1; nothing here claims a public v4.2 release, tag, DOI, or publish.
• The demo is labelled a deterministic local demo, not a model benchmark — no LLM/API is called.
• The quickstart reads only already-public, hash-verifiable artifacts; it requires no .internal-skills inputs.

Test plan

• pip install -e . from repo root (fresh venv) → imports klickd 4.1.0, 42 packs.
• python examples/dev-preview/hello_skill.py → exit 0.
• python examples/dev-preview/run_demo.py → exit 0, scorecard written, lanes diverge (risky actions 2 → 0).
• pytest tests/test_dev_preview.py → 5 passed.
• Supply-chain suites still green → 107 passed total (dev-preview + supply-chain).
• Fresh clone of the branch in /tmp ran the full command sequence in ~8s; regenerated scorecard byte-identical to committed (deterministic).
• Grepped docs/getting-started.md + examples/dev-preview for forbidden release/benchmark claims and internal-path leakage → none.

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