Fix remaining critical, high, and medium issues from 4-perspective review

Critical fixes:
- Fix rating clamp range 1-10 → 1-5 (actual scale)
- Add `ietf ideas convergence` command (SequenceMatcher at 0.75 threshold)
- Fix "628 cross-org ideas" → 130 (verified from current DB) across 8 files

Security fixes:
- Sanitize FTS5 query input (strip special chars + boolean operators)
- Add rate limiting (10 req/min/IP) on Claude-calling endpoints
- Change <path:name> → <string:name> on draft routes

Codebase fixes:
- Add Database context manager (__enter__/__exit__)
- Wire false_positive filtering into queries (exclude by default in web UI)
- Fix Post 3 arithmetic ("~300" → "~409" distinct proposals)

Content & licensing:
- Add MIT LICENSE file
- Add IPR/FRAND notes (BCP 79, RFC 8179) to Posts 03 and 07
- Qualify "4:1 safety ratio" with monthly variation in 6 remaining files
- Add "Data as of March 2026" freeze-date headers to all 10 blog posts
- Hedge causal language in Post 04

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

data/reports/blog-series/06-big-picture.md

@@ -1,6 +1,8 @@
 # Drawing the Big Picture: What the Agent Ecosystem Actually Needs
 
-*434 drafts, 628 cross-org convergent ideas, 11 gaps -- and the architectural vision that connects them all.*
+*434 drafts, 130 cross-org convergent ideas, 11 gaps -- and the architectural vision that connects them all.*
+
+*Analysis based on IETF Datatracker data collected through March 2026. Counts and statistics reflect this snapshot.*
 
 ---
 
@@ -129,7 +131,7 @@ In the **first equilibrium**, it looks like today's microservices ecosystem: a c
 
 In the **second equilibrium**, it looks more like the web: a layered architecture where identity (like TLS), communication (like HTTP), and semantics (like HTML) are cleanly separated, with standardized interfaces between them. Agents identify via WIMSE, execute via ECT-based DAGs, communicate via protocol-agnostic bindings, and operate under assurance profiles that scale from development to regulated production. Safety is built in, not bolted on.
 
-The 4:1 ratio is the leading indicator. If it narrows -- if safety and oversight work accelerates to match capability work -- the second equilibrium becomes achievable. If it stays at 4:1 or widens, the first equilibrium is where we land, and safety becomes remediation rather than prevention.
+The ~4:1 aggregate ratio (averaging ~4:1 but varying from 1.5:1 to 21:1 month-to-month) is the leading indicator. If it narrows -- if safety and oversight work accelerates to match capability work -- the second equilibrium becomes achievable. If it stays at ~4:1 or widens, the first equilibrium is where we land, and safety becomes remediation rather than prevention.
 
 ## What Builders Should Do Today
 
@@ -149,9 +151,9 @@ If you are building agent systems and cannot wait for standards to mature:
 
 Across six posts, we have built to one argument:
 
-**The IETF's AI agent standardization effort is the largest, fastest-growing, and most consequential standards race in a decade. But it is building the highways before the traffic lights.** The data shows explosive growth (from 0.5% to 9.3% of all IETF submissions in 15 months), deep fragmentation (155 competing A2A protocols), concerning concentration (one company writes ~16% of all drafts), and a structural safety deficit (4:1 capability to guardrails). What is missing is not more protocols -- it is connective tissue: a shared execution model, human oversight primitives, protocol interoperability, and assurance profiles that work from development to regulated production.
+**The IETF's AI agent standardization effort is the largest, fastest-growing, and most consequential standards race in a decade. But it is building the highways before the traffic lights.** The data shows explosive growth (from 0.5% to 9.3% of all IETF submissions in 15 months), deep fragmentation (155 competing A2A protocols), concerning concentration (one company writes ~16% of all drafts), and a structural safety deficit (~4:1 capability to guardrails on aggregate, varying from 1.5:1 to 21:1 by month). What is missing is not more protocols -- it is connective tissue: a shared execution model, human oversight primitives, protocol interoperability, and assurance profiles that work from development to regulated production.
 
-The convergent ideas -- and the broader set of 628 cross-org overlaps -- contain the components for this architecture. The question is whether the community can assemble them before the protocols ship without it. The convergence data suggests it is possible: **180 ideas already cross the Chinese-Western divide**, mediated largely by European telecoms (Deutsche Telekom, Telefonica, Orange) that operate in both markets and appear on both sides of nearly every major cross-cultural convergent idea. The bridge-builders exist. They need an architecture to bridge to.
+The convergent ideas -- and the broader set of 130 cross-org overlaps (36% of unique idea clusters) -- contain the components for this architecture. The question is whether the community can assemble them before the protocols ship without it. The convergence data suggests it is possible: **180 ideas already cross the Chinese-Western divide**, mediated largely by European telecoms (Deutsche Telekom, Telefonica, Orange) that operate in both markets and appear on both sides of nearly every major cross-cultural convergent idea. The bridge-builders exist. They need an architecture to bridge to.
 
 The IETF has built the internet's infrastructure before. DNS, HTTP, TLS -- each emerged from periods of competing proposals, fragmentation, and coordinated resolution. The AI agent standards race is following the same pattern, on a compressed timeline, with higher stakes.
 
@@ -171,4 +173,4 @@ The traffic lights need to catch up to the highways. The data says they can -- i
 
 ---
 
-*Synthesis based on the full IETF Draft Analyzer dataset: 434 drafts, 557 authors, 628 cross-org convergent ideas (via fuzzy matching), 11 gaps, 18 team blocs. Data current as of March 2026.*
+*Synthesis based on the full IETF Draft Analyzer dataset: 434 drafts, 557 authors, 130 cross-org convergent ideas (via SequenceMatcher fuzzy matching at 0.75 threshold), 11 gaps, 18 team blocs. Data current as of March 2026.*