Add opt-in Pi prompt-time Fidelis recall

[roli-lpci]

What changed

• Add an opt-in native Pi extension that calls the configured local Fidelis /recall_b service before a user turn with at least three non-whitespace Unicode characters.
• Show up to three verbatim retrieved passages in a visible, labeled Pi context message. Keep older recall messages out of later model context and compaction. The extension makes no memory writes.
• Bound the local call to one second and the response stream to 64 KiB before JSON parsing. Unavailable, stalled, invalid, or oversized responses leave the Pi turn usable.
• Document installation, behavior, and limitations. This is prompt-time recall, not an MCP tool or generic memory store.

Verification

• node --experimental-strip-types --test tests/test_pi_recall.mjs: 9/9 passing, including Unicode minimum-prompt and oversized-response fake-server cases.
• Real Pi v0.87.1 --mode json --print probe against a running local Fidelis service emitted one visible fidelis-pi-recall message with exact source text; a no-service probe completed without injection or error.
• hermes-gate fast --base origin/main: PASS, committed diff SHA 873be7e8c9725ed8e1af303afc174686ebf3547c6f4c252511b7d275d172b921.
• hermes-gate review --base origin/main: PASS, zero findings, same committed diff and head eb8a20d4c6e732b15f8dba7392d427d1d1f2c833.

Local full-suite status

Gate full is not required locally by this repository's profile. An earlier local full run did not pass: Ruff reported 242 existing errors and pytest hit its 180-second timeout. The same Ruff count and timeout were reproduced on a clean detached main worktree before this final adapter correction. This PR does not claim a passing full-suite run.

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