docs(hooks): add "reading the full output" to agent instructions

[tiagodocouto]

Summary

• Adds a "Reading the full output" section to every agent instruction template (hooks/*/rtk-awareness.md and rules.md). The templates tell agents to run commands through rtk, but not how to recover the complete, unfiltered output when the filtered summary isn't enough — e.g. to confirm a "tests pass" / "build clean" claim rather than skim it. Both raw paths already exist (rtk proxy <cmd> and the [full output: <path>] tee log) but weren't documented where agents actually read. Mirrors the principle already in CONTRIBUTING.md (respect explicitly-requested detail).
• The Claude template also replaces a dangling Refer to CLAUDE.md line with rtk --help.
• Docs-only; the section is identical across all 7 templates.

Test plan

• cargo fmt --all && cargo clippy --all-targets && cargo test — fmt clean, test 1974 passed, 0 failed. (clippy hits a pre-existing uninlined_format_args lint in build.rs, untouched by this docs-only diff; CI is green on develop.)
• Manual testing: inspected rtk cargo test (filtered) vs rtk proxy cargo test (raw) vs the [full output: <path>] tee log against a failing and a non-compiling crate — the documented behavior matches.

[CLAassistant]

All committers have signed the CLA.

[rtk-release-bot]

This pull request has been automatically marked as stale due to 90 days of inactivity. If this pull request is still relevant, please leave any comment (for example, "bump"), and we'll keep it open. Your contribution is very much appreciated — we're sorry we haven't been able to review it yet.

[KuSh]

Thanks for writing this up. The per-agent instruction templates were consolidated into a single agent-neutral hooks/rtk-awareness.md in #3372, merged 2026-09-07, and that file already tells the agent that truncated results state their own recovery path and to re-run a command as rtk proxy <cmd> when the filtered result is unusable; the full variant lists rtk proxy <cmd> in its command reference too. Six of the seven files this PR edits no longer exist on develop, so I am closing it as covered. If you think a point from your section is still missing from the consolidated text, please comment or reopen.