fix(cli): print all MCP text blocks from tool results

[ScriptedAlchemy]

tracedecay tool <name> printed only content[0].text; when a handler prepends a warning block (stale-index banner, automation nag), the payload and metrics were silently discarded — stale-index projects got warnings instead of results, exit 0. Now joins every text block, blank-line separated.

Status: COMPLETE — all checks green, ready for review

Found by the 74-tool markdown-output audit (P0 finding); the identical fix was independently produced by a Codex session and a workflow agent — this lands the Codex single-commit version; the duplicate hunk in feat/plugin-suite-improvements falls away on rebase.

Recovery context

• Orchestrating Claude session: 2c51d204-3565-4a10-833d-d8fbd51620c3 — tracedecay tool message_search --query 'multi-block CLI payload'
• Durable fact Fix MCP protocol error semantics #24 (markdown audit incl. this P0) — tracedecay tool fact_store --action get --fact-id 24

🤖 Generated with Claude Code

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[ScriptedAlchemy]

Full recovery manifest (all session + workflow ids)

Main orchestrating session: 2c51d204-3565-4a10-833d-d8fbd51620c3 (claude, /home/zack/projects/tracedecay) — tracedecay tool lcm_load_session --provider claude --session-id 2c51d204-3565-4a10-833d-d8fbd51620c3

Workflow runs (transcripts: session dir → subagents/workflows/<run_id>/):

Run	Purpose	Status
wf_785c5851-aee	plugin-suite wave 1 (grep, telemetry, Claude surfaces, steering)	completed; E/F/H died on session limit
wf_7f23bed7-803	triple-plugin completion (all 8 tasks + review + verify)	wave 1 cached; resumed
wf_bcfa3aa1-ac9 / wf_2ede3e1d-75a / wf_d002080a-6e2	auto-sync D1–D7 (attempts 1/2/3)	3rd attempt active
wf_d0bf6fa4-48f	36-scenario eval corpus (sonnet+codex)	done → fact 28
wf_d0ae2099-bfe	obscure-tool evals + missed-opportunity hunt	done → fact 33
wf_f46d3a1c-ccb	session-git-correlation build (this feature)	active

Research agents (task transcripts in the session's tasks/ dir): a24542ee4f08eee98 markdown audit→fact 24 · a143ce24edd3525f7 adoption research→fact 21 · a07f2677c93ebc313 rstest diagnosis→fact 23 · af4d3dac14e17f59c eval baseline+opus rerun→fact 25 · a3cfc66f0ca02f263 freshness design→fact 22 · ab49d9ae2d3a5f72d skill-pattern study (children af2210c6ae0c73588, af50cc51138da9bb2)→fact 29 · a546e5bb4d17b8ac6 hermetic harness

Durable decisions: facts 17–39 in this project's fact store (tracedecay tool fact_store --action search --query 'recovery manifest' → fact 39 has this table).

[ScriptedAlchemy]

Superseded — safe to close. The CLI multi-block fix here (join_content_text, joining all content[*].text blocks) is now in master via the merged #280 (verified: 12 matches in src/tool_command.rs on master). This PR is fully redundant. Recommend closing.

[ScriptedAlchemy]

Closing as redundant: the CLI multi-block fix (join_content_text) merged into master via #280 (verified: present in src/tool_command.rs on master). No unique changes remain here.