(MOT-3873) feat(console): code mode picker

[ytallo]

feat(console): code mode in the chat composer

Adds 'code' to the mode picker. A code-mode send omits the explicit
functions policy so the harness applies its curated native coding
toolset, and swaps in the coding identity prompt; the working-dir
fs_scope metadata is unchanged.

fix(shell): coder::context resolves the fs_scope root, not the jail primary

The workspace snapshot ignored the harness-stamped filesystem scope and
always described the configured primary root, so a scoped session's git
state and instruction files were missing. The effective root is now the
canonicalized fs_scope root (session_root confinement) when present, and
instruction files resolve through resolve_opt against it.

feat(harness): code prompt — environment block is pre-fetched, skip redundant coder::context

Fixes MOT-3873

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[github-actions]

skill-check — worker

0 verified, 32 skipped (no docs/).

Layer	Result
structure	✓
vale	✓
ai	✓
render	✓

Four for four. Nicely done.

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[ytallo]

Consolidated into #423.