fix(capabilities): read host_compat from package.json after 2026.6 repackage

[minion1227]

what changed

_load_host_compat() (and the #237 drift tests) now read openclaw.compat.pluginApi from package.json instead of openclaw.plugin.json.

why

two PRs collided on test. the #237 host-compat feature reads the pluginApi floor from openclaw.plugin.json. the 2026.6 openclaw repackage (47ac72f) then moved that floor into the new loader-facing package.json — its commit message is explicit that the current loader ignores openclaw.plugin.json's openclaw.* fields, so package.json → openclaw.compat.pluginApi is now the single source of truth.

result on test today: _load_host_compat() reads a key that no longer exists, host_compat silently degrades to {}, and both drift tests fail:

• test_capabilities_host_compat_matches_openclaw_manifest → KeyError: 'openclaw'
• test_capabilities_host_compat_present_and_nonempty → assert 'openclaw' in {}

this points the reader and the tests at package.json where the floor now lives, restoring the drift check. graceful-degradation on a missing/malformed manifest is preserved (those tests move with it).

what might break

nothing on disk or on the wire. host_compat now reports {"openclaw": {"pluginApi": ">=2026.6.0"}} again instead of {}. standalone-wheel installs without package.json still degrade to {} (covered by test).

tests

• pytest tests/test_capabilities.py — 5/5 green
• ruff check src tests — clean
• mypy src — clean
• full pytest (minus embeddings) — green

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[minion1227]

merge-order note: please merge this PR before #297 and #301.

all three carry the same one-line host_compat fix (#297 and #301 have it folded in so their ci goes green against the current, still-broken test). this pr is the canonical, single-purpose fix. if #297/#301 merge first, this one looks redundant and risks being closed — merging it first keeps it as the source of the fix, and #297/#301 then merge cleanly on top (identical content dedups, no conflict).